Mercedes-Benz G-Klasse W463
Weaknesses, engine ratings and buying advice
612 PS
G 65 AMG · Benzin
V12 BiTurbo in a Military Box — Maximum Absurdity
Legendary!136–177 PS
3.0L R6 Diesel Diesel
7 weaknesses
Good Choice525–585 PS
5.5L V8 BiTurbo Benzin
11 weaknesses
Stay Away!Generations
Engine Overview
The Mercedes-Benz G-Klasse W463 is available with 15 engine variants — from 94 to 630 hp. 1 variants had engine changes — the model year is crucial.
Five-cylinder naturally aspirated diesel with pre-chamber injection. Legendarily reliable, high mileages possible. Keep to oil change intervals.
- !! Bosch VE pump: fuel leak in cold weather from 200,000 km
The Bosch VE injection pump frequently leaks at mileages above 200,000 km, particularly at low temperatures. Fuel drips down the engine block.
Symptoms: Fuel smell and drips on cold start, visible dampness below the injection pump, fuel consumption increases slightly - !! Glow plugs seized in head from 160,000 km
On 5-cylinder engines with higher mileage, glow plugs seize in the cylinder head. When removed, the plug can shear off, requiring a helicoil insert.
Symptoms: Poor cold start despite fresh battery, rough running in the first few minutes - !! Head Gasket Leaks Due to Head Warp from 250,000 km
The OM602 is prone to head gasket failure due to a warped cylinder head, especially after overheating. Failure preferentially between cylinder 1 and timing cover.
Symptoms: External oil loss at the head, hydraulic tappet ticking after cold start, blue smoke when starting, coolant loss, oil film in expansion tank
+ 4 more engine weaknesses + vehicle weaknesses
V6 diesel with common rail and piezo injectors. Powerful and refined. Known for blocked oil coolers, swirl flap failure and EGR problems. High mileages possible with good maintenance.
- !! Oil Cooler Gaskets Leaking — Oil and Coolant Loss from 120,000 km
The best-known problem of the OM642: the oil cooler gaskets in the V-section of the engine fail. Oil leaks into the coolant or externally. Particularly prone on vehicles built up to 2009.
Symptoms: Oil loss warning, oil spots under the left side of the vehicle, oil streaks visible on the belt tensioner - !! Swirl Flap Linkage Breaks — Plastic Joint Fails from 100,000 km
The plastic linkages of the swirl flaps in the OM642 intake manifold break. Aluminium repair kits are available and more durable. In the event of complete failure there is a risk of debris entering the engine.
Symptoms: Engine warning light, fault codes for intake flap/swirl flap, power loss particularly at low rpm - !! Injector Seal Leaking — Soot Deposits and Diesel in Oil from 120,000 km
Piezo injectors seal poorly from heat, diesel enters the engine oil. Oil loses lubrication properties, tar-like residue around injectors is the typical telltale sign.
Symptoms: Rough idle, increased fuel consumption, knocking noises, oil level rising due to diesel contamination, engine oil smells of diesel
+ 4 more engine weaknesses + vehicle weaknesses
Inline-six diesel, partly with turbocharging. Very solid engine with high refinement. Injection pump can cause problems with age.
- !! Timing chain: stretch at very high mileage from 400,000 km
The OM606 is considered extremely robust, but the timing chain can stretch from around 400,000 km. With turbo conversion and increased sustained load, this occurs earlier.
Symptoms: Rattling from the timing chain area on cold start, starting difficulties with heavily stretched chain - !! Head Gasket on Overheating or Extreme Mileage from 400,000 km
The OM606 is more robust than the OM603, but head gasket damage occurs on overheating or at extreme mileage. When the head needs to be resurfaced, costs rise significantly.
Symptoms: Coolant loss, white smoke from exhaust, oil film in expansion tank, engine overheats sporadically, power loss - !! Turbocharger Vacuum Control Wears Out from 200,000 km
The OM606 LA (turbo) uses vacuum boost pressure control, which develops leaks with age. Replacement turbocharger approximately €650 (aftermarket), original Mercedes approximately €1,900.
Symptoms: Power loss under load, whistling from turbocharger, blue smoke at full load, boost pressure gauge reading erratic
+ 4 more engine weaknesses + vehicle weaknesses
V6 diesel with common rail and piezo injectors. Powerful and refined. Known for blocked oil coolers, swirl flap failure and EGR problems. High mileages possible with good maintenance.
- !! Oil Cooler Gaskets Leaking — Oil and Coolant Loss from 120,000 km
The best-known problem of the OM642: the oil cooler gaskets in the V-section of the engine fail. Oil leaks into the coolant or externally. Particularly prone on vehicles built up to 2009.
Symptoms: Oil loss warning, oil spots under the left side of the vehicle, oil streaks visible on the belt tensioner - !! Swirl Flap Linkage Breaks — Plastic Joint Fails from 100,000 km
The plastic linkages of the swirl flaps in the OM642 intake manifold break. Aluminium repair kits are available and more durable. In the event of complete failure there is a risk of debris entering the engine.
Symptoms: Engine warning light, fault codes for intake flap/swirl flap, power loss particularly at low rpm - !! Injector Seal Leaking — Soot Deposits and Diesel in Oil from 120,000 km
Piezo injectors seal poorly from heat, diesel enters the engine oil. Oil loses lubrication properties, tar-like residue around injectors is the typical telltale sign.
Symptoms: Rough idle, increased fuel consumption, knocking noises, oil level rising due to diesel contamination, engine oil smells of diesel
+ 4 more engine weaknesses + vehicle weaknesses
V6 diesel with common rail and piezo injectors. Powerful and refined. Known for blocked oil coolers, swirl flap failure and EGR problems. High mileages possible with good maintenance.
- !! Oil Cooler Gaskets Leaking — Oil and Coolant Loss from 120,000 km
The best-known problem of the OM642: the oil cooler gaskets in the V-section of the engine fail. Oil leaks into the coolant or externally. Particularly prone on vehicles built up to 2009.
Symptoms: Oil loss warning, oil spots under the left side of the vehicle, oil streaks visible on the belt tensioner - !! Swirl Flap Linkage Breaks — Plastic Joint Fails from 100,000 km
The plastic linkages of the swirl flaps in the OM642 intake manifold break. Aluminium repair kits are available and more durable. In the event of complete failure there is a risk of debris entering the engine.
Symptoms: Engine warning light, fault codes for intake flap/swirl flap, power loss particularly at low rpm - !! Injector Seal Leaking — Soot Deposits and Diesel in Oil from 120,000 km
Piezo injectors seal poorly from heat, diesel enters the engine oil. Oil loses lubrication properties, tar-like residue around injectors is the typical telltale sign.
Symptoms: Rough idle, increased fuel consumption, knocking noises, oil level rising due to diesel contamination, engine oil smells of diesel
+ 4 more engine weaknesses + vehicle weaknesses
V6 diesel with common rail and piezo injectors. Powerful and refined. Known for blocked oil coolers, swirl flap failure and EGR problems. High mileages possible with good maintenance.
- !! Oil Cooler Gaskets Leaking — Oil and Coolant Loss from 120,000 km
The best-known problem of the OM642: the oil cooler gaskets in the V-section of the engine fail. Oil leaks into the coolant or externally. Particularly prone on vehicles built up to 2009.
Symptoms: Oil loss warning, oil spots under the left side of the vehicle, oil streaks visible on the belt tensioner - !! Swirl Flap Linkage Breaks — Plastic Joint Fails from 100,000 km
The plastic linkages of the swirl flaps in the OM642 intake manifold break. Aluminium repair kits are available and more durable. In the event of complete failure there is a risk of debris entering the engine.
Symptoms: Engine warning light, fault codes for intake flap/swirl flap, power loss particularly at low rpm - !! Injector Seal Leaking — Soot Deposits and Diesel in Oil from 120,000 km
Piezo injectors seal poorly from heat, diesel enters the engine oil. Oil loses lubrication properties, tar-like residue around injectors is the typical telltale sign.
Symptoms: Rough idle, increased fuel consumption, knocking noises, oil level rising due to diesel contamination, engine oil smells of diesel
+ 4 more engine weaknesses + vehicle weaknesses
Inline-six diesel with pre-chamber or swirl-chamber injection. Turbocharged version powerful for the era. Solid long-distance runners.
- !! Chain tensioner: wear leads to engine damage from 240,000 km
The hydraulic chain tensioner wears at high mileage. A stretched timing chain can skip at high rpm, causing valve-to-piston contact.
Symptoms: Rattling from the timing chain area on cold start, metallic clacking, rough engine running - !! Vacuum pump: bearing failure with timing chain damage from 200,000 km
The vacuum pump bearing wears and fails. Released bearing balls can get between the timing chain and sprocket, causing catastrophic engine damage.
Symptoms: Reduced brake feel (hard pedal), weak servo assistance, sudden metallic noises - !! Vacuum Pump: Radial Shaft Seal Leaking from 250,000 km
A leaking radial shaft seal on the vacuum pump lets oil into the vacuum circuit. Result: brake booster works unreliably — safety relevant!
Symptoms: Brakes sporadically feel hard with no servo assistance, increased pedal travel, oil traces on vacuum line, inconsistent braking effect
+ 3 more engine weaknesses + vehicle weaknesses
Mercedes' first V8 diesel in automotive history — world premiere in 2000. Common rail at 1,350 bar, two turbos in tandem, 4.0 litres. Result: 570 Nm from 1,600 rpm, a character that no petrol engine of that class could match in composure at the time. Maintenance-intensive. Timing chain and tensioners are due around 150,000 km — not optional, mandatory. The right-hand turbocharger is the known weakness and will need replacing sooner or later. Injectors and high-pressure pump dislike poor-quality fuel. Oil every 10,000 km, Mercedes approval 229.51 or better — the engine does not forgive cutting corners on lubricant. With thorough maintenance 300,000 km is realistic. None of this is cheap, but anyone who buys a V8 diesel budgets for it.
- !! Timing chain and tensioner worn from 160,000 km
Timing chain stretches from around 150,000 km; chain tensioner and guides wear. Cold-start rattling is a typical early warning. Left untreated, chain jump and total engine failure threaten.
Symptoms: Metallic rattling on cold start that subsides after 3-5 seconds. With severe stretch also audible at operating temperature. - !! Bi-turbo failure (right turbocharger preferentially) from 100,000 km
The right turbocharger is the classic weak point of the OM628. Total failure of both turbos from around 90,000-100,000 km has been documented. Repair on the V8 diesel is correspondingly labour-intensive.
Symptoms: Significant power loss, blue or white smoke from exhaust, whistling noise under load. - !! Coolant loss through cylinder head from 200,000 km
Under extreme pressure loading, head gaskets fail. CO2 enters the cooling system; increased pressure pushes coolant out through the expansion tank. Engine removal required for repair.
Symptoms: Coolant warning light, coolant overflows from expansion tank, coolant level drops continuously.
+ 3 more engine weaknesses + vehicle weaknesses
Naturally aspirated V8 in three displacements from 4.3 to 5.5 litres — old-school character with no turbo lag. Linear power delivery, deep rumble from 2,000 rpm building to a hoarse roar above 5,000. Peak torque at 3,000; beyond that it thins out — yet it's silky in part-throttle and surprisingly economical. Achilles heel is the seals: rear crankshaft oil seal practically universal above 150,000 km (gearbox removal required, 600–900 EUR), valve covers and oil filter housing seep with age. All cheap parts. The one critical point: the rubber damper on the crankshaft pulley hardens with age — when it fails the pulley machines into the sump. Replace preventively every 150,000 km. Oil changes every 10,000 km with 5W-40, 16 spark plugs every 60,000–80,000 km — then 400,000 km is realistic.
- !! Vibration Damper/Pulley — Rubber Hardens from 170,000 km
The rubber damper in the crankshaft pulley hardens with age and can eat into the sump — catastrophic consequential damage. Preventive replacement every 150,000 km strongly recommended.
Symptoms: Unusual vibrations at idle, in worst case metallic scraping from below. Often no prior warning — sudden failure. - !! Rear Crankshaft Seal Leaking from 150,000 km
The rear crankshaft seal is leaking on virtually all M113 engines above 150,000 km. Gearbox removal required — 600–900 EUR workshop costs. If oil creeps into the torque converter it becomes expensive.
Symptoms: Oil drops or oil film visible at the engine-gearbox interface, oil loss without any other apparent leak on the engine. - !! Engine Mounts Worn Prematurely from 90,000 km
Engine mounts can fail before 100,000 km. Practical test: finger between the stabiliser bar and front sump — no clearance means the mount is dead. Not visually checkable without removal.
Symptoms: Vibrations in interior especially at idle, dull rumbling on acceleration, in worst case contact between engine and bodywork.
+ 7 more engine weaknesses + vehicle weaknesses
5.5-litre V8 BiTurbo — AMG's first forced-induction V8 and the successor to the naturally aspirated M156. 525–585 hp depending on model, up to 900 Nm in the S version. The character is fundamentally different from the M156: instead of a high-revving scream, a brutal torque wave from 1,750 rpm. The sound is deeper, more bass-heavy, with a characteristic turbo hiss on lift-off. Less emotional than the naturally aspirated engine, but in a different league on the motorway — above 200 km/h the M157 still accelerates like others do at 100. Timing chain is the known Achilles heel: chain tensioner failure at 80,000–120,000 km, Mercedes has improved the design (non-return valve in cylinder head oil gallery). Piezo injectors are sensitive to fuel quality, service life 100,000–150,000 km. Turbos last 200,000+ km with proper warm-up and cool-down — shut off immediately after a motorway run and they'll fail significantly earlier. Warm up the engine, allow cool-down after hard use, oil changes every 10,000 km with 0W-40 — then 300,000 km is realistic.
- !! Timing Chain Stretch — M157 BiTurbo V8 from 100,000 km
The timing chains on the M157 5.5L BiTurbo V8 stretch, especially on vehicles with frequent cold starts and short trips. Engine damage possible if chain jumps. Extensive repair on the V8.
Symptoms: Metallic rattling on cold start, camshaft position fault codes, rough running, in extreme cases engine damage - !! Oil Consumption from Piston Ring Wear from 120,000 km
Under heavy use the piston rings on the M157 wear prematurely. Oil consumption above 1 L/1,000 km is possible. Engine overhaul required with advanced wear.
Symptoms: Rising oil consumption, blue smoke on acceleration, oil mist from exhaust, oil level warnings - !! High-Pressure Fuel Pump Fails — No Fuel Pressure from 100,000 km
The high-pressure fuel pump on the M157 can wear internally at high mileage. Pressure drop in the rail causes difficult starting and power loss.
Symptoms: Difficult starting, power loss under load, hesitation at high rpm, fuel pressure fault codes
+ 8 more engine weaknesses + vehicle weaknesses
Hand-built in Affalterbach to the One Man, One Engine principle — plaque with signature on the cam cover. Architecture: two separate six-cylinder banks, SOHC, three valves per cylinder (2 intake, 1 exhaust), derived directly from the M120 V12. 1,000 Nm from 2,300 rpm, electronically limited — the actual mechanical torque is estimated at 1,200 Nm. Dual ignition with 24 spark plugs, four catalytic converters (one pre-cat and one main cat per bank). At idle at 600 rpm virtually vibration-free — a deep, silky rumble. At full throttle a baritonal-metallic hiss that expands into a roar. No turbo lag: the torque plateau is so wide that boost build-up is barely perceptible. At 130 km/h the engine turns at approximately 1,700 rpm. 12.7 litres of oil capacity, major service from 1,500 EUR, 24-plug change from 900 EUR. ABC system overhaul can run into five figures. Maintained properly, one of the most effortlessly capable powerplants available.
- !! Ignition module bank failure — two potted units at ~€1,400 each from 80,000 km
The M279 uses two fully potted ignition module banks for six cylinders each. Not repairable — replacement only. Failure documented from 60,000–100,000 km. Labour time is high due to tight packaging in the V-valley.
Symptoms: Misfires on one cylinder bank, rough running, power loss, check engine light with ignition fault code. - !! Turbocharger bearing wear — full turbo pair replacement from 120,000 km
Both turbochargers wear at their bearing surfaces at high mileage. Replacing both turbos on the V12 requires extensive disassembly. Parts and labour costs run into five figures.
Symptoms: Metallic whine under load, oil loss at turbo mounting, power drop, blue smoke at full throttle. - !! Oil cooler gasket leaking in the V-valley from 90,000 km
The oil cooler sits centrally in the V-valley between the cylinder banks. The gasket becomes brittle under temperature cycling. Complete failure risks oil-coolant emulsification and overheating. Access is labour-intensive due to intake system removal.
Symptoms: Oil weeping visible in V-valley, possible oil-coolant emulsion on dipstick, oil smell after engine shutdown, coolant discolouration.
+ 9 more engine weaknesses + vehicle weaknesses
Inline-six with four-valve technology. Solid, long-lived engine with good refinement. Keep to regular cambelt change intervals.
- !! Head Gasket Leaking — Coolant Loss from 200,000 km
The M104 head gasket fails at high mileage. Coolant enters the cylinders or the oil. Repair requires removing the head and resurfacing.
Symptoms: Coolant loss without visible leak, white exhaust plume, mayonnaise on oil cap, rising coolant temperature - !! Chain Tensioner Leaking — Oil at Timing Cover from 180,000 km
The hydraulic chain tensioner on the M104 leaks oil at the timing chain housing. The leak causes oil loss and can cause chain rattling if it fails.
Symptoms: Oil spot at front of engine, brief rattling after cold start, dropping oil level - !! Distributor Cap and Rotor Wear Out from 60,000 km
The M104 inline-six carries a conventional ignition distributor on the exhaust camshaft. Cap and rotor wear out, cracks in the distributor cap cause arcing in wet conditions.
Symptoms: Stumbling under load, misfires in wet conditions, poor cold-start behaviour, rough idle at cold start
+ 4 more engine weaknesses + vehicle weaknesses
Three-valve V6 with individual ignition coils. Smooth and strong. Typical weak points: crankcase breather and intake manifold flaps. High mileages achievable.
- !! Camshaft Adjuster Leaks Oil into Wiring Harness from 130,000 km
The camshaft adjuster solenoid on the M112 develops a leak and draws oil by capillary action into the wiring harness. Oil can migrate as far as the engine ECU and destroy it.
Symptoms: Cold-start rattling that disappears after 1–2 seconds, camshaft adjuster fault code, oil traces at wiring connector, later ECU faults - !! Intake Manifold Vacuum Hose Breaks from 120,000 km
The vacuum hose for the variable intake manifold on the M112 becomes brittle and breaks. The swirl flaps stick. The hose is not available individually — the entire intake manifold is needed.
Symptoms: Power drop, slight hesitation at part throttle, engine runs but without full power - !! Valve Cover Gasket and Front Cover Gasket Leaking from 130,000 km
On the M112 V6 the valve cover gaskets become porous over time. Especially the rubber seals on the front cover between the timing cover and engine block fail on virtually all high-mileage M112 engines.
Symptoms: Oil spots on the floor, oil smell after driving, oily engine bay, dropping oil level
+ 4 more engine weaknesses + vehicle weaknesses
Naturally aspirated V8 in three displacements from 4.3 to 5.5 litres — old-school character with no turbo lag. Linear power delivery, deep rumble from 2,000 rpm building to a hoarse roar above 5,000. Peak torque at 3,000; beyond that it thins out — yet it's silky in part-throttle and surprisingly economical. Achilles heel is the seals: rear crankshaft oil seal practically universal above 150,000 km (gearbox removal required, 600–900 EUR), valve covers and oil filter housing seep with age. All cheap parts. The one critical point: the rubber damper on the crankshaft pulley hardens with age — when it fails the pulley machines into the sump. Replace preventively every 150,000 km. Oil changes every 10,000 km with 5W-40, 16 spark plugs every 60,000–80,000 km — then 400,000 km is realistic.
- !! Vibration Damper/Pulley — Rubber Hardens from 170,000 km
The rubber damper in the crankshaft pulley hardens with age and can eat into the sump — catastrophic consequential damage. Preventive replacement every 150,000 km strongly recommended.
Symptoms: Unusual vibrations at idle, in worst case metallic scraping from below. Often no prior warning — sudden failure. - !! Rear Crankshaft Seal Leaking from 150,000 km
The rear crankshaft seal is leaking on virtually all M113 engines above 150,000 km. Gearbox removal required — 600–900 EUR workshop costs. If oil creeps into the torque converter it becomes expensive.
Symptoms: Oil drops or oil film visible at the engine-gearbox interface, oil loss without any other apparent leak on the engine. - !! Engine Mounts Worn Prematurely from 90,000 km
Engine mounts can fail before 100,000 km. Practical test: finger between the stabiliser bar and front sump — no clearance means the mount is dead. Not visually checkable without removal.
Symptoms: Vibrations in interior especially at idle, dull rumbling on acceleration, in worst case contact between engine and bodywork.
+ 7 more engine weaknesses + vehicle weaknesses
5.4-litre V8 with Eaton Lysholm twin-screw supercharger — the legendary 'Kompressor' AMG. 476–500 hp depending on model, 700+ Nm from 2,650 rpm. The sound is unmistakable: a deep V8 rumble overlaid with the characteristic supercharger whine under load — at full throttle a mechanical scream that's instantly addictive. Torque arrives like a wave: gently swelling then brutal. No turbo lag, no throttle delay — the supercharger delivers boost from idle. Tuning potential is enormous: a pulley swap (83 mm instead of 87 mm) adds 40–50 hp at the rear wheels, and the community has pushed the engine beyond 800+ hp. Critical maintenance points: supercharger magnetic clutch (check air gap 0.35–0.45 mm), charge air cooler pump (low-temperature circuit), rear crankshaft seal. Oil changes with 0W-40 every 10,000 km. Pre-2004 engines had more teething problems — noticeably more mature from 2004. One of the most robust AMG engines ever built when maintained properly.
- !! Supercharger Bearings — Wear at High Mileage from 120,000 km
The Eaton supercharger bearings wear after 100,000+ km — mechanical noise increases, in worst case the supercharger seizes. Check supercharger oil (120–130 ml) regularly. Replacement supercharger from 1,200 EUR, complete with installation 2,500–3,500 EUR.
Symptoms: Increasing mechanical whining/howling from the supercharger even at low rpm, metallic grinding under load, supercharger oil loss. - !! Cooling System — Hoses and Thermostat Age from 80,000 km
Coolant hoses become brittle after 10+ years and can burst without warning — particularly critical on a supercharged V8 with high heat rejection. Thermostat occasionally sticks open. Complete coolant hose set as prevention from 60,000 km recommended.
Symptoms: Coolant temperature rises above 100°C, coolant steam under the bonnet, coolant loss, sweet smell from vents. - !! Supercharger Magnetic Clutch — Wear and Slipping from 80,000 km
The Eaton supercharger magnetic clutch wears over time — friction material wears, supercharger sporadically fails to engage. Air gap (clearance) must be 0.35–0.45 mm; above 0.8 mm the clutch no longer engages reliably. Aftermarket pulley modifications worsen the problem if air gap is not correctly set.
Symptoms: Sporadic power loss at full throttle, supercharger does not engage (no supercharger whine audible), EPC fault message in instrument cluster, releasing and re-applying throttle helps briefly.
+ 6 more engine weaknesses + vehicle weaknesses
Twelve cylinders, two turbochargers, a V-valley layout — technically fascinating and maintenance-intensive in equal measure. The fully encapsulated ignition module system with two banks at 1,400 EUR each is the most well-known cost factor; failure of both banks usually follows in quick succession. The oil-water heat exchanger in the V-valley almost always leaks eventually — factor in engine removal for the repair. The four camshaft solenoids fail to seal reliably after 80,000–100,000 km; oil creeps into the wiring harness and corrodes control units. Both turbochargers sit deep under the engine bay — removal and installation costs more than the turbo itself. Runs without issue beyond 300,000 km with diligent maintenance; what kills it is deferred servicing. Purchase requirement: complete service history, documented wiring harness check, no ABC alarm backlog, fresh ignition modules.
- !! Ignition module bank failure (two banks at ~€1,400 each) from 120,000 km
Both ignition module banks are fully potted wear items with a typical service life of 10–15 years. Failures tend to follow each other quickly. OEM cost approximately €1,400 each.
Symptoms: Jerking and power loss, rough running, misfire codes P0307–P0312, petrol smell from the exhaust - !! Turbocharger wear and wastegate wear from 180,000 km
The two turbochargers show bearing and wastegate wear at high mileage. Engine removal is required for replacement; repair costs €2,000–4,000 per turbo.
Symptoms: Whistling or rattling turbo noises, power loss under hard acceleration, blue smoke from oil loss - !! ABC hydraulic lines and engine mounts — double defect from 100,000 km
The M275 V12 Biturbo in the S600/CL600 puts extreme stress on the engine mounts due to its weight (>300 kg engine). At the same time, the ABC hydraulic lines age and leak. Both issues frequently occur together.
Symptoms: ABC suspension hydraulic oil loss, engine sitting lower, vibrations in the cabin, ABC warning message
+ 6 more engine weaknesses + vehicle weaknesses
Vehicle Weaknesses
| Weakness | Cost | |
|---|---|---|
| Window frames and lower door edges rust heavily The W463 rusts structurally at window frames (not painted inside from the factory), lower door edges and sills. This problem runs through all model years up to 2018. Symptoms: Rust bubbles at doors and window frames, rust at sill-to-B-pillar transition, paint flaking off from 120,000 km | High | |
| Ladder frame corrosion at spring seats The steel ladder frame corrodes at spring seats and cross-members. The double-shell construction is insufficiently sealed and traps moisture. Symptoms: Rust on frame members underneath the vehicle, material loss at spring seats from 150,000 km | High | |
| Rust on window frames and tailgate Window frames are not painted on the inside from the factory and rust heavily. Tailgate and frame sections rust due to missing factory treatment. Full rust treatment up to 7,600 EUR. Symptoms: Rust at window rubbers and surrounds, paint blistering on tailgate, rust on frame sections below doors | High |
Test Reports
TÜV Report 2024
The classic G-Class shows age-appropriate defect rates with strengths in robust suspension components.
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Known Problems and Issues +
A total of 105 weaknesses have been documented for the Mercedes-Benz G-Klasse W463 (1990–2018) — 98 engine-related and 7 vehicle-related. 3 problem engines: OM642 (3.0L V6 Diesel), M157 (5.5L V8 BiTurbo), M275 (5.5L V12 BiTurbo). Typical issues affect Rust, Suspension, Electronics. Considered reliable: OM606 (3.0L R6 Diesel).
G-Klasse (OM602, 1990–1992) — Be Careful: Bosch VE pump: fuel leak in cold weather, Glow plugs seized in head, Head Gasket Leaks Due to Head Warp. Power: 94 PS.
G-Klasse (OM603, 1992–1997) — Be Careful: Chain tensioner: wear leads to engine damage, Vacuum pump: bearing failure with timing chain damage, Vacuum Pump: Radial Shaft Seal Leaking. Power: 136 PS.
G-Klasse (OM628, 2001–2005) — Be Careful: Timing chain and tensioner worn, Bi-turbo failure (right turbocharger preferentially), Coolant loss through cylinder head. Power: 250 PS.
G-Klasse (OM642, 2005–2008) — Stay Away!: Oil Cooler Gaskets Leaking — Oil and Coolant Loss, Swirl Flap Linkage Breaks — Plastic Joint Fails, Injector Seal Leaking — Soot Deposits and Diesel in Oil. Power: 224 PS.
G-Klasse (OM642, 2008–2012) — Stay Away!: Oil Cooler Gaskets Leaking — Oil and Coolant Loss, Swirl Flap Linkage Breaks — Plastic Joint Fails, Injector Seal Leaking — Soot Deposits and Diesel in Oil. Power: 250 PS.
G-Klasse (OM642, 2010–2018) — Stay Away!: Oil Cooler Gaskets Leaking — Oil and Coolant Loss, Swirl Flap Linkage Breaks — Plastic Joint Fails, Injector Seal Leaking — Soot Deposits and Diesel in Oil. Power: 245 PS.
G-Klasse (OM642, 2012–2018) — Stay Away!: Oil Cooler Gaskets Leaking — Oil and Coolant Loss, Swirl Flap Linkage Breaks — Plastic Joint Fails, Injector Seal Leaking — Soot Deposits and Diesel in Oil. Power: 286 PS.
G-Klasse (M104, 1994–1997) — Be Careful: Head Gasket Leaking — Coolant Loss, Chain Tensioner Leaking — Oil at Timing Cover, Distributor Cap and Rotor Wear Out. Power: 211–215 PS.
G-Klasse (M112, 1997–2000) — Be Careful: Camshaft Adjuster Leaks Oil into Wiring Harness, Intake Manifold Vacuum Hose Breaks, Valve Cover Gasket and Front Cover Gasket Leaking. Power: 211–215 PS.
G-Klasse (M113, 1998–2008) — Be Careful: Vibration Damper/Pulley — Rubber Hardens, Rear Crankshaft Seal Leaking, Engine Mounts Worn Prematurely. Power: 296 PS.
G-Klasse (M113, 2004–2012) — Be Careful: Vibration Damper/Pulley — Rubber Hardens, Rear Crankshaft Seal Leaking, Engine Mounts Worn Prematurely. Power: 500–507 PS.
G-Klasse (M113K, 2004–2012) — Be Careful: Supercharger Bearings — Wear at High Mileage, Cooling System — Hoses and Thermostat Age, Supercharger Magnetic Clutch — Wear and Slipping. Power: 500–507 PS.
G-Klasse (M157, 2012–2018) — Stay Away!: Timing Chain Stretch — M157 BiTurbo V8, Oil Consumption from Piston Ring Wear, High-Pressure Fuel Pump Fails — No Fuel Pressure. Power: 544 PS.
G-Klasse (M275, 2012–2018) — Stay Away!: Ignition module bank failure (two banks at ~€1,400 each), Turbocharger wear and wastegate wear, ABC hydraulic lines and engine mounts — double defect. Power: 612 PS.
G-Klasse (M279, 2012–2018) — Be Careful: Ignition module bank failure — two potted units at ~€1,400 each, Turbocharger bearing wear — full turbo pair replacement, Oil cooler gasket leaking in the V-valley. Power: 612 PS.
What to watch out for with the Mercedes-Benz G-Klasse? See the detailed listing of all engine and vehicle weaknesses in the sections above.
Frequently Asked Questions
What problems and weaknesses does the Mercedes-Benz G-Klasse W463 have? +
What should I look for when buying a used Mercedes-Benz G-Klasse W463? +
Which engine is recommended? +
Which Mercedes-Benz G-Klasse W463 engine is the most reliable? +
Which Mercedes-Benz G-Klasse W463 engine is the most fun? +
Is the Mercedes-Benz G-Klasse W463 worth buying used? +
What horsepower variants are available for the Mercedes-Benz G-Klasse W463? +
Last updated: February 2026 · All information without guarantee