Porsche 911 964
Weaknesses, engine ratings and buying advice
360 PS
Turbo 3.6 · Benzin
Rarer than the RS 2.7 — and more brutal
Legendary!250 PS
3.6L Benzin
8 weaknesses
Stay Away!Body Variants
The Porsche 911 964 is available as Coupé and Convertible — choose your body type for specific insurance data:
Generations
Engine Overview
The Porsche 911 964 is available with 5 engine variants — from 250 to 360 hp. 1 variants had engine changes — the model year is crucial.
The M64.01 is the transitional engine par excellence: 3.6 litres, 184 kW, the first 911 engine worldwide in identical specification for all markets. New cylinder heads, revised camshafts, twin-spark ignition — more than just a bored-out 3.2. Sonically more refined than the 930.20: richer, rounder in torque, less raw at idle. The core character isn't lost though — the boxer is unmistakable, just more grown up. The critical issue on early 964s (1990–mid 1992): the Freudenberg dual-mass flywheel. It develops internal play and often fails between 25,000 and 50,000 km — with noises alarmingly similar to a rod bearing. From mid-1992 the proven LUK flywheel, which is durable. Buying rule: either from mid-1992 or proof that the Freudenberg was replaced with LUK. Oil leaks are age-typical — moisture on valve covers and chain housing isn't alarming, drips are.
- !! Broken cylinder studs — engine overhaul required from 100,000 km
Age, thermal stress and Loctite bonding make the studs brittle. When they break, hot exhaust gases escape and permanently damage the cylinder head and liner. Engine overhaul costs €8,000–15,000.
Symptoms: Power loss in individual cylinders; compression loss; exhaust smell during operation; often only visible when removing the valve cover. - !! Oil lines burst (high-pressure line) from 80,000 km
The high-pressure lines from the thermostat housing to the oil filter housing become brittle and corroded with age. If they burst while driving, the oil pump drains the sump in seconds — engine failure. Preventive replacement strongly recommended.
Symptoms: Oil spots in the right wheel arch; visible corrosion on hose crimp fittings; sudden oil pressure warning during driving. - !! Timing chain tensioner and timing chain worn from 150,000 km
At high mileage, the chain tensioners rattle on cold start until oil pressure builds up. Worn tensioners can be pushed in with two fingers. Timing chain replacement requires complete engine disassembly.
Symptoms: Metallic rattling for 2–5 seconds on cold start; noise fades once at operating temperature. With heavy wear also present when warm.
+ 5 more engine weaknesses + vehicle weaknesses
Technically identical to the M64.01 — same 3.6-litre boxer, identical 184 kW, same weaknesses. Denotes exclusively the combination with the 4-speed Tiptronic (only in the Carrera 2, never in the Carrera 4). The 964-era Tiptronic is a torque-converter automatic with a manually shiftable gate — technically remarkable for its time, but far removed from modern dual-clutch gearboxes. Same Freudenberg flywheel issue until mid-1992.
- !! Broken cylinder studs — engine overhaul required from 100,000 km
Age, thermal stress and Loctite bonding make the studs brittle. When they break, hot exhaust gases escape and permanently damage the cylinder head and liner. Engine overhaul costs €8,000–15,000.
Symptoms: Power loss in individual cylinders; compression loss; exhaust smell during operation; often only visible when removing the valve cover. - !! Oil lines burst (high-pressure line) from 80,000 km
The high-pressure lines from the thermostat housing to the oil filter housing become brittle and corroded with age. If they burst while driving, the oil pump drains the sump in seconds — engine failure. Preventive replacement strongly recommended.
Symptoms: Oil spots in the right wheel arch; visible corrosion on hose crimp fittings; sudden oil pressure warning during driving. - !! Timing chain tensioner and timing chain worn from 150,000 km
At high mileage, the chain tensioners rattle on cold start until oil pressure builds up. Worn tensioners can be pushed in with two fingers. Timing chain replacement requires complete engine disassembly.
Symptoms: Metallic rattling for 2–5 seconds on cold start; noise fades once at operating temperature. With heavy wear also present when warm.
+ 4 more engine weaknesses + vehicle weaknesses
The M64.01 is the transitional engine par excellence: 3.6 litres, 184 kW, the first 911 engine worldwide in identical specification for all markets. New cylinder heads, revised camshafts, twin-spark ignition — more than just a bored-out 3.2. Sonically more refined than the 930.20: richer, rounder in torque, less raw at idle. The core character isn't lost though — the boxer is unmistakable, just more grown up. The critical issue on early 964s (1990–mid 1992): the Freudenberg dual-mass flywheel. It develops internal play and often fails between 25,000 and 50,000 km — with noises alarmingly similar to a rod bearing. From mid-1992 the proven LUK flywheel, which is durable. Buying rule: either from mid-1992 or proof that the Freudenberg was replaced with LUK. Oil leaks are age-typical — moisture on valve covers and chain housing isn't alarming, drips are.
- !! Broken cylinder studs — engine overhaul required from 100,000 km
Age, thermal stress and Loctite bonding make the studs brittle. When they break, hot exhaust gases escape and permanently damage the cylinder head and liner. Engine overhaul costs €8,000–15,000.
Symptoms: Power loss in individual cylinders; compression loss; exhaust smell during operation; often only visible when removing the valve cover. - !! Oil lines burst (high-pressure line) from 80,000 km
The high-pressure lines from the thermostat housing to the oil filter housing become brittle and corroded with age. If they burst while driving, the oil pump drains the sump in seconds — engine failure. Preventive replacement strongly recommended.
Symptoms: Oil spots in the right wheel arch; visible corrosion on hose crimp fittings; sudden oil pressure warning during driving. - !! Timing chain tensioner and timing chain worn from 150,000 km
At high mileage, the chain tensioners rattle on cold start until oil pressure builds up. Worn tensioners can be pushed in with two fingers. Timing chain replacement requires complete engine disassembly.
Symptoms: Metallic rattling for 2–5 seconds on cold start; noise fades once at operating temperature. With heavy wear also present when warm.
+ 5 more engine weaknesses + vehicle weaknesses
The M64.03 is the carefully prepared RS boxer of the 964: same 3.6-litre displacement, but with hand-matched piston-cylinder pairings, re-tuned Bosch Motronic (98 octane), solid rubber engine mounts instead of hydraulic, and a 7 kg lighter single-mass flywheel. 191 kW vs. 184 kW — but more importantly: rev willingness increases noticeably, the engine feels more direct and alive. Dry sump lubrication as standard. Sonically closer to the raw 930.20 character than the standard 964 — less refined, more expressive. Only around 2,282 Tourings and roughly 100 Sport variants built. Most RS cars were well maintained but also stressed through racing — engine history is decisive. Spare parts scarce and expensive.
- !! Broken cylinder studs — engine overhaul required from 100,000 km
Age, thermal stress and Loctite bonding make the studs brittle. When they break, hot exhaust gases escape and permanently damage the cylinder head and liner. Engine overhaul costs €8,000–15,000.
Symptoms: Power loss in individual cylinders; compression loss; exhaust smell during operation; often only visible when removing the valve cover. - !! Oil lines burst (high-pressure line) from 80,000 km
The high-pressure lines from the thermostat housing to the oil filter housing become brittle and corroded with age. If they burst while driving, the oil pump drains the sump in seconds — engine failure. Preventive replacement strongly recommended.
Symptoms: Oil spots in the right wheel arch; visible corrosion on hose crimp fittings; sudden oil pressure warning during driving. - !! Timing chain tensioner and timing chain worn from 150,000 km
At high mileage, the chain tensioners rattle on cold start until oil pressure builds up. Worn tensioners can be pushed in with two fingers. Timing chain replacement requires complete engine disassembly.
Symptoms: Metallic rattling for 2–5 seconds on cold start; noise fades once at operating temperature. With heavy wear also present when warm.
+ 4 more engine weaknesses + vehicle weaknesses
The M30.69 is a direct descendant of the original 930 turbo engine: 3.3 litres, one KKK turbocharger, 235 kW, proven in various evolution stages since 1978. What remains: the infamous turbo lag. Up to about 3,500 rpm comparatively little happens — then the turbo builds boost and 450 Nm hit the rear wheels abruptly. That's not a flaw, it's character — but character that can kill. No ESP, no stability control. The M30 block is mechanically robust and durable. Check valve clearances regularly. The early 964 Turbos (up to 1992) have the problematic Freudenberg dual-mass flywheel. The external oil lines of the dry sump system must be inspected for cracks — a burst oil line ruins the engine in seconds. Always let the turbo idle down after long motorway runs.
- !! Wastegate diaphragm porous (boost pressure issues) from 80,000 km
The rubber wastegate diaphragm becomes porous from heat stress and no longer seals. The result is uncontrolled boost pressure. Aftermarket solution (Turbosmart/Tial) approx. €450–550.
Symptoms: Fluctuating boost pressure; power spikes and drops under acceleration; boost pressure drop at full throttle. - !! Broken head studs (cylinder head turbo) from 100,000 km
Identical issue to the naturally aspirated engine: stud bolts become brittle from thermal stress. On the Turbo the higher combustion pressure causes even greater thermal stress. Stud bolt inspection at valve adjustment is mandatory.
Symptoms: Compression loss, power drop, exhaust smell in the engine bay. - !! Fuel lines porous (high-pressure system) from 80,000 km
The 964 Turbo runs its fuel system at over 6 bar. Original fuel lines become porous and can split in the engine bay. Fire risk on contact with hot turbo components.
Symptoms: Fuel smell in engine bay; visible cracks in rubber lines; fuel drops under the vehicle.
+ 2 more engine weaknesses + vehicle weaknesses
The M64.50 is the technical pinnacle of the 964 Turbo story: based on the M64 block instead of the old M30, with KKK K27 turbocharger and 265 kW. Built only for model years 1993/94, around 1,437 examples worldwide — rarer than the legendary Carrera RS 2.7. The turbo lag is shorter and the torque plateau broader than the M30.69. 520 Nm from 4,200 rpm, 0–100 under 4.8 seconds — without electronic driver aids, not a beginner's car. Technically more robust than the M30.69, but extremely expensive in parts due to rarity. Matching numbers (original engine and gearbox) is value-determining.
- !! Turbo bearings worn (cooldown required) from 100,000 km
The turbocharger requires a cool-down period after every drive. If the engine is switched off immediately, residual oil bakes onto hot bearings — bearing wear and shaft seal damage follow.
Symptoms: Whining or grinding noise from the turbo area; oil smoke on cold start; elevated oil consumption; power loss. - !! Turbo bearing wear (KKK K27) from 120,000 km
The KKK K27 turbo wears on its plain bearings at high mileage. Especially when the engine is not allowed to cool down after full-load driving. Oil flow coking increases, bearing clearance grows.
Symptoms: Whistling noise from the turbo; increasing oil consumption; blue smoke on cold start and after boost; uneven boost pressure. - !! K27 turbocharger bearing wear from 80,000 km
The K27-7200 turbo bearings wear through heat soak after engine shutdown. Oil bakes in the bearing, cold-start smoke and declining boost are typical consequences.
Symptoms: Bluish smoke on cold start, gradual power loss, oil visible in the charge air hose
+ 7 more engine weaknesses + vehicle weaknesses
Vehicle Weaknesses
| Weakness | Cost | |
|---|---|---|
| Front Axle Control Arm Bushings Rubber bushings in the front control arms wear after approximately 80,000 km. Full control arm replacement necessary — bushings cannot be pressed in separately. Symptoms: Knocking from the front axle; imprecise steering; car pulls under braking. from 80,000 km | High |
Top Reported Issues
Alternatives
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Known Problems and Issues +
A total of 45 weaknesses have been documented for the Porsche 911 964 (1989–1994) — 37 engine-related and 8 vehicle-related. 4 problem engines: M64.01 (3.6L), M64.02 (3.6L), M64.03 (3.6L), M30.69 (3.3L Turbo). Typical issues affect Suspension, Rust, HVAC, Electronics.
911 (M64.01, 1989–1993) — Stay Away!: Broken cylinder studs — engine overhaul required, Oil lines burst (high-pressure line), Timing chain tensioner and timing chain worn. Power: 250 PS.
911 (M64.02, 1989–1993) — Stay Away!: Broken cylinder studs — engine overhaul required, Oil lines burst (high-pressure line), Timing chain tensioner and timing chain worn. Power: 250 PS.
911 (M30.69, 1990–1993) — Stay Away!: Wastegate diaphragm porous (boost pressure issues), Broken head studs (cylinder head turbo), Fuel lines porous (high-pressure system). Power: 320 PS.
911 (M64.03, 1991–1993) — Stay Away!: Broken cylinder studs — engine overhaul required, Oil lines burst (high-pressure line), Timing chain tensioner and timing chain worn. Power: 260 PS.
911 (M64.50, 1993–1994) — Be Careful: Turbo bearings worn (cooldown required), Turbo bearing wear (KKK K27), K27 turbocharger bearing wear. Power: 360 PS.
What to watch out for with the Porsche 911? See the detailed listing of all engine and vehicle weaknesses in the sections above.
Frequently Asked Questions
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Last updated: February 2026 · All information without guarantee