Mercedes-Benz CLK C208
Weaknesses, engine ratings and buying advice
The CLK C208 (1997–2003) is the youngtimer Mercedes with W202 underpinnings — timeless coupe and cabriolet design, but rust is THE issue. Mercedes used cathodic dip painting (KTL) in this era, which ages far worse than the full galvanising of later models. Sills, floor panels, jack points and wheel arches rot through structurally on unsealed cars. A ramp inspection is mandatory before any purchase — if the sills are gone, no repair makes financial sense.
Engine choice: The M112 (CLK 320, 3.2L V6, 218 hp) is the recommended engine — naturally aspirated V6, silky smooth, long-lived, no serious serial defects. 200,000+ km without engine problems is standard. The M111 (CLK 200/CLK 200K, 136–163 hp) is the entry point — solid four-cylinder, cheap to run. The M113 (CLK 430/CLK 55 AMG) delivers V8 character, but higher fuel consumption (14–16 L) and pricier parts make it an enthusiast's car.
The cabriolet hydraulics (A208) are the second major expense: folding top hydraulic cylinders leak after 80,000–100,000 km, oil stains in the trunk, top gets stuck. Full overhaul of all cylinders: $2,000–9,000. Individual cylinders cheaper, but it is often a domino effect. Pixel failure in the instrument cluster affects virtually every C208 — LCD rows drop out, specialist repair from $90. The EZS (electronic ignition lock) stops recognising the key around 150,000 km — steering stays locked, engine will not start.
Test-drive checklist: Underbody on ramp — tap sills, inspect floor panels. Coolant colour (milky = Valeo oil cooler on automatics). Instrument cluster for pixel faults. Cabriolet: operate top fully open and closed, check trunk for oil traces. Steering for play.
2026 market: CLK 200/200K Coupe from $2,000 (project cars). Good CLK 320 Coupe $4,500–9,000. CLK 430/55 AMG $6,500–16,500. Cabriolet premium +20–30%. `Insider pick:` CLK 320 (M112) Coupe from 1999, rust-free underbody, full service history — the most carefree engine in the most elegant Mercedes coupe of its era. Successor is the CLK C209.
347 PS
CLK 55 AMG · Benzin
C208 AMG — Rawer, More Honest Than Its Successor
Legendary!143–204 PS
1.8L Kompressor Benzin
6 weaknesses
Stay Away!Body Variants
The Mercedes-Benz CLK C208 is available as Convertible and Coupé — choose your body type for specific insurance data:
Generations
Engine Overview
The Mercedes-Benz CLK C208 is available with 6 engine variants — from 121 to 517 hp.
Proven four-cylinder with optional supercharger. Robust and long-lived; the supercharged variant has good torque. Supercharger magnetic clutch can wear.
- !! Head Gasket Ages and Leaks from 120,000 km
One of the most common weak points of the M111: the head gasket becomes porous and starts leaking between 75,000 and 150,000 km. Typical for older M111 engines.
Symptoms: Coolant loss without visible leak, white exhaust plume, oil-coolant emulsion, engine overheats - !! Supercharger Magnetic Clutch Fails from 100,000 km
The supercharger magnetic clutch and the K40 relay are weak points on the M111 Kompressor. The clutch no longer engages, supercharger boost is absent. K40 relay is often repairable at low cost.
Symptoms: Sudden power loss from approx. 3,000 rpm, supercharger cuts in sporadically or not at all - !! Ignition Coils Wear Out Due to Neglected Spark Plugs from 80,000 km
If spark plugs are left too long in the M111, the voltage load on the ignition coils increases substantially. Always replace ignition coil and spark plug together.
Symptoms: Stumbling under load, engine misfires, ignition failure in individual cylinders, CEL, rough idle
+ 3 more engine weaknesses + vehicle weaknesses
Proven four-cylinder with optional supercharger. Robust and long-lived; the supercharged variant has good torque. Supercharger magnetic clutch can wear.
- !! Head Gasket Ages and Leaks from 120,000 km
One of the most common weak points of the M111: the head gasket becomes porous and starts leaking between 75,000 and 150,000 km. Typical for older M111 engines.
Symptoms: Coolant loss without visible leak, white exhaust plume, oil-coolant emulsion, engine overheats - !! Supercharger Magnetic Clutch Fails from 100,000 km
The supercharger magnetic clutch and the K40 relay are weak points on the M111 Kompressor. The clutch no longer engages, supercharger boost is absent. K40 relay is often repairable at low cost.
Symptoms: Sudden power loss from approx. 3,000 rpm, supercharger cuts in sporadically or not at all - !! Ignition Coils Wear Out Due to Neglected Spark Plugs from 80,000 km
If spark plugs are left too long in the M111, the voltage load on the ignition coils increases substantially. Always replace ignition coil and spark plug together.
Symptoms: Stumbling under load, engine misfires, ignition failure in individual cylinders, CEL, rough idle
+ 3 more engine weaknesses + vehicle weaknesses
Proven four-cylinder with optional supercharger. Robust and long-lived; the supercharged variant has good torque. Supercharger magnetic clutch can wear.
- !! Head Gasket Ages and Leaks from 120,000 km
One of the most common weak points of the M111: the head gasket becomes porous and starts leaking between 75,000 and 150,000 km. Typical for older M111 engines.
Symptoms: Coolant loss without visible leak, white exhaust plume, oil-coolant emulsion, engine overheats - !! Supercharger Magnetic Clutch Fails from 100,000 km
The supercharger magnetic clutch and the K40 relay are weak points on the M111 Kompressor. The clutch no longer engages, supercharger boost is absent. K40 relay is often repairable at low cost.
Symptoms: Sudden power loss from approx. 3,000 rpm, supercharger cuts in sporadically or not at all - !! Ignition Coils Wear Out Due to Neglected Spark Plugs from 80,000 km
If spark plugs are left too long in the M111, the voltage load on the ignition coils increases substantially. Always replace ignition coil and spark plug together.
Symptoms: Stumbling under load, engine misfires, ignition failure in individual cylinders, CEL, rough idle
+ 3 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
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
Vehicle Weaknesses
| Weakness | Cost | |
|---|---|---|
| Rust on Wheel Arches, Lower Door Edges and Bumper Transitions Design flaw: vibrating trim strips grind away the paint and allow rust to form. Front and rear wheel arches, lower door edges, boot lock area and bumper transitions particularly affected. Symptoms: Rust blisters at inner wheel arch lip, rust under door trim strips, peeling paint from 100,000 km | High | |
| Structural Rust on Sills and Floor Panels Sills, floor panels and jack points rust through structurally on vehicles without cavity sealing. Inadequate factory corrosion protection is the root cause. Once advanced, repair is no longer economically viable. Symptoms: Rusted-through sills, crumbling jack points, water ingress in footwell through floor holes | High |
Test Reports
TÜV Report 2024
The CLK C208 shows age-appropriate fault rates as an older vehicle, around the class median for its age group.
2023-11Alternatives
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Known Problems and Issues +
A total of 44 weaknesses have been documented for the Mercedes-Benz CLK C208 (1997–2003) — 35 engine-related and 9 vehicle-related. 2 problem engines: M271 (1.8L Kompressor), OM612 (2.7L 5-Zyl Diesel). Typical issues affect Rust, Gearbox, Body, Suspension.
CLK (OM612, 2002–2005) — Stay Away!: "Black Death" -- injector seal failure with tar formation, EGR cooler fails -- coolant in intake, Cylinder head crack -- coolant loss under load. Power: 163–170 PS.
CLK (M111, 1997–2002) — Be Careful: Head Gasket Ages and Leaks, Supercharger Magnetic Clutch Fails, Ignition Coils Wear Out Due to Neglected Spark Plugs. Power: 136 PS.
CLK (M111, 1997–2000) — Be Careful: Head Gasket Ages and Leaks, Supercharger Magnetic Clutch Fails, Ignition Coils Wear Out Due to Neglected Spark Plugs. Power: 192 PS.
CLK (M111, 1997–2000) — Be Careful: Head Gasket Ages and Leaks, Supercharger Magnetic Clutch Fails, Ignition Coils Wear Out Due to Neglected Spark Plugs. Power: 193–197 PS.
CLK (M112, 1997–2002) — Be Careful: Camshaft Adjuster Leaks Oil into Wiring Harness, Intake Manifold Vacuum Hose Breaks, Valve Cover Gasket and Front Cover Gasket Leaking. Power: 218 PS.
CLK (M113, 1998–2002) — Be Careful: Vibration Damper/Pulley — Rubber Hardens, Rear Crankshaft Seal Leaking, Engine Mounts Worn Prematurely. Power: 279 PS.
CLK (M113, 1999–2002) — Be Careful: Vibration Damper/Pulley — Rubber Hardens, Rear Crankshaft Seal Leaking, Engine Mounts Worn Prematurely. Power: 347 PS.
CLK (M111, 2000–2002) — Be Careful: Head Gasket Ages and Leaks, Supercharger Magnetic Clutch Fails, Ignition Coils Wear Out Due to Neglected Spark Plugs. Power: 163 PS.
CLK (M112, 2002–2005) — Be Careful: Camshaft Adjuster Leaks Oil into Wiring Harness, Intake Manifold Vacuum Hose Breaks, Valve Cover Gasket and Front Cover Gasket Leaking. Power: 163–170 PS.
CLK (M113, 2002–2006) — Be Careful: Vibration Damper/Pulley — Rubber Hardens, Rear Crankshaft Seal Leaking, Engine Mounts Worn Prematurely. Power: 306 PS.
CLK (M113, 2002–2006) — Be Careful: Vibration Damper/Pulley — Rubber Hardens, Rear Crankshaft Seal Leaking, Engine Mounts Worn Prematurely. Power: 367 PS.
CLK (M271, 2002–2006) — Stay Away!: Timing Chain Stretches Prematurely, Camshaft Adjuster Leaks — Oil in Wiring Harness, Camshaft Adjuster Leaks Oil into Connector. Power: 163–170 PS.
What to watch out for with the Mercedes-Benz CLK? 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 CLK C208 have? +
What should I look for when buying a used Mercedes-Benz CLK C208? +
Which engine is recommended? +
Which Mercedes-Benz CLK C208 engine is the most fun? +
Is the Mercedes-Benz CLK C208 worth buying used? +
What horsepower variants are available for the Mercedes-Benz CLK C208? +
Last updated: February 2026 · All information without guarantee