Porsche Cayman 987(987c)
Weaknesses, engine ratings and buying advice
The Porsche Cayman 987 (2005–2012) is the mid-engine coupe that splits into two fundamentally different cars depending on which side of 2009 you buy. The 987.1 (2005–2008) carries the M96/M97 engine family with all its known issues. The 987.2 (2009–2012) got the revised MA1 engine that eliminated the two biggest failure modes. This is THE purchase decision.
Here’s what breaks on the 987.1: The base 2.7L Cayman uses the M96.25 flat-six with a larger dual-row IMS bearing — statistically the safest M96 variant with under 1% documented failure rate and no bore scoring pattern. The Cayman S 3.4L runs the M97.21">M97.21 with forged pistons on Lokasil-coated bores — and that combination scores cylinder walls at a documented 2–10% rate. A bore scoring rebuild runs $16,500–27,500. There is no fix short of new cylinders or a complete engine. The IMS bearing on the S uses the weaker single-row 6204 unit (2006–2008), though failure rates on the 3.4L are lower than on the 996/997 because the Cayman’s shorter oil passages provide better lubrication to the bearing.
The AOS (air-oil separator) fails across all 987.1 variants. Diaphragm tears, crankcase pressure builds, oil gets pushed past seals. Symptoms: blue smoke on startup, oil residue around the engine bay, fouled O2 sensors. Parts cost $150–350, labor is the expense because of mid-engine access.
The 987.2 (2009–2012) changed the game. The MA1.20 (2.9L base, 265 hp) and MA1.21 (3.4L S, 320 hp) engines eliminated the IMS bearing entirely — the intermediate shaft now runs on a plain bearing with pressurized oil feed. Bore scoring is nearly zero on MA1 engines because Porsche switched to a revised piston coating and tighter tolerances. The 987.2 is a fundamentally different ownership proposition.
Both generations share: hydraulic engine mount failure (clunking over bumps, $450–900 per side), RMS (rear main seal) oil leaks contaminating the clutch on manual cars ($1,500–2,000 with clutch replacement), and the Tiptronic valve body wearing on automatic cars. PDK was not available on the 987.
Test-drive checklist: Cold start: any chain rattle beyond 30 seconds = guide wear. 987.1 S: ask for borescope documentation or budget for one ($200–450). Oil filler cap: milky residue = failed AOS. Underside: oil seepage at bellhousing = RMS. Engine mounts: clunking over speed bumps at low speed. Clutch engagement point: very high = near end of life.
2026 market: 987.1 base from $13,000–22,000. 987.1 S from $20,000–31,000. 987.2 base from $27,500–42,000. 987.2 S from $38,500–57,000. The price gap between 987.1 and 987.2 reflects the risk gap accurately.
Insider pick: 987.2 Cayman S (MA1.21) manual, 2009–2012, no IMS concern, bore scoring nearly zero — 320 hp, hydraulic steering, no driver aids to numb the experience. If budget is tight, the 987.1 base 2.7L is the rational entry point: larger IMS bearing, no bore scoring history, and $13,000 buys a mid-engine Porsche that statistically holds together. Cross-reference: Boxster 986 for the open-top alternative on the same platform.
330 PS
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The Best 987 — Light, Sharp, Mechanical
Legendary!Generations
Engine Overview
The Porsche Cayman 987 is available with 4 engine variants — from 245 to 330 hp. 1 variants had engine changes — the model year is crucial.
The base Cayman engine brings technically the same substance as the 2.7-litre Boxster, but is housed in a fundamentally stiffer body. The Cayman's closed body transmits road feedback more directly — often described as "sharper", occasionally as "more nervous". The boxer sound in the Cayman differs from the open Boxster due to the metal roof: more resonance, a slight drone at certain revs. IMS bearing here too — check at purchase. For suspension purists the Cayman is the more logical car; anyone seeking emotional openness reaches for the Boxster.
- !! Bore Scoring: Cylinder Wall Wear Cayman 2.7 from 105,000 km
Open-deck block with Lokasil coating. Regular oil changes (annually rather than the 2-year interval) and gentle cold starts are critical.
Symptoms: Metallic knock on cold start, elevated oil consumption, blue smoke. - !! IMS Dual-Row Bearing: Real Failure Risk from 100,000 km
Cayman 987 (2005–2006) uses the dual-row IMS bearing. Failure rate 1–2% under warranty. Corrosion from seasonal use remains the primary cause.
Symptoms: Bearing grinding noise, metal particles in oil filter. - !! Coolant Pipe Housing Cracks from 100,000 km
The plastic front coolant pipe housing cracks at the seal seat due to thermal cycling. Coolant loss up to 1 litre per 300 km. Engine must be lowered for repair.
Symptoms: Coolant level dropping without visible puddle, coolant smell in the engine bay, damp spots under the engine.
+ 7 more engine weaknesses + vehicle weaknesses
With the switch to direct injection (DFI) and 2.9-litre displacement, Porsche structurally solves the IMS problem — the MA1.20 runs on a new engine block without an intermediate shaft bearing. That's the news that's welcomed: no IMS, no purchase stress. Sonically the 987.2 is by prevailing opinion "cleaner, but less raw" than its predecessor — the cleaner sound profile of DFI engines lacks the organic roughness of the M96 for some. More reliable, more modern, lower maintenance: technically the step forward. Emotionally a small step back for purists.
- !! Bore scoring on Alusil cylinders from 80,000 km
Alusil cylinder bores can score due to faulty injectors or cold-start abuse. Engine can seize. Repair cost €10,000–20,000.
Symptoms: Increased oil consumption, blue smoke on cold start, bore scoring visible on borescope - !! High-pressure fuel pump (HPFP) failure from 120,000 km
The DFI high-pressure fuel pump fails and is often unavailable for months. Poor cold starting is the early symptom.
Symptoms: Engine starts only on the third attempt, yellow engine warning light, P1024/P1026 - !! Water pump / thermostat premature failure from 90,000 km
On the MA1 water pump failure occurs through bearing damage or shaft seal leak, commonly from 80,000–100,000 km. The thermostat typically fails open — no overheating, but increased fuel consumption.
Symptoms: Engine takes a very long time to reach operating temperature, fuel consumption rises, intermittent coolant warning.
+ 5 more engine weaknesses + vehicle weaknesses
The 3.4-litre DFI of the 987.2 is the most refined variant of the classic boxer concept — powerful, high-revving and with significantly better throttle response than the predecessors through variable valve timing on both camshafts. No IMS: that's the decisive quality leap over the 987.1. Whether the sound has lost some rawness compared to the M96 is debated — consensus is that a SAGA or aftermarket exhaust brings it back. The strongest and technically best "old" boxer, before the 3.8-litre from the 911 entered the range.
- !! Bore scoring on Alusil cylinders from 80,000 km
Alusil cylinder bores can score due to faulty injectors or cold-start abuse. Engine can seize. Repair cost €10,000–20,000.
Symptoms: Increased oil consumption, blue smoke on cold start, bore scoring visible on borescope - !! Water pump / thermostat premature failure from 85,000 km
The MA1.21 (3.4L) runs under higher thermal load than the 2.9L. Water pump failure through bearing or seal wear can lead to localised overheating. Replacement interval of 80,000–100,000 km recommended.
Symptoms: Long warm-up time, coolant loss, squealing from belt drive, coolant temperature rises noticeably in town traffic. - !! High-pressure fuel pump (HPFP) failure from 120,000 km
The DFI high-pressure fuel pump fails and is often unavailable for months. Poor cold starting is the early symptom.
Symptoms: Engine only starts on the third attempt, amber engine warning light, P1024/P1026
+ 5 more engine weaknesses + vehicle weaknesses
The 987.1's 3.4-litre — the first genuine displacement jump in the S model beyond the previous 3.2. The engine revs with keen motivation and has a sound at the top that many regard as the reference. VarioCam Plus and 295–320 hp make it the most powerful of the "old" boxer naturally aspirated engines without direct injection. The IMS bearing is present on the 3.4 too — Cayman S 987.1 included. This engine is called "the heart of the 987.1" and recommended over the 2.7 almost universally if the budget allows. An engine that once heard at full volume is never forgotten.
- !! Bore Scoring: Cylinder Wall Wear 3.4L from 105,000 km
Same open-deck issues as the M97.20. Thicker cylinder walls from the larger displacement give slightly more tolerance, but no complete protection.
Symptoms: Metallic knock when cold, elevated oil consumption, declining power. - !! IMS Dual-Row Bearing: Real Failure Risk from 100,000 km
Same dual-row IMS bearing. Affects Boxster S and Cayman S equally. Preventive replacement at clutch change recommended.
Symptoms: Bearing grinding noise, metal particles in oil filter. - !! Coolant Pipe Housing Cracks from 90,000 km
The plastic front coolant pipe housing cracks at the seal seat due to thermal cycling. The higher thermal load of the 3.4L S model tends to bring the failure earlier.
Symptoms: Coolant level dropping without visible puddle, coolant smell in the engine bay, sporadic overheating tendency.
+ 7 more engine weaknesses + vehicle weaknesses
The 3.4-litre DFI of the 987.2 is the most refined variant of the classic boxer concept — powerful, high-revving and with significantly better throttle response than the predecessors through variable valve timing on both camshafts. No IMS: that's the decisive quality leap over the 987.1. Whether the sound has lost some rawness compared to the M96 is debated — consensus is that a SAGA or aftermarket exhaust brings it back. The strongest and technically best "old" boxer, before the 3.8-litre from the 911 entered the range.
- !! Bore scoring on Alusil cylinders from 80,000 km
Alusil cylinder bores can score due to faulty injectors or cold-start abuse. Engine can seize. Repair cost €10,000–20,000.
Symptoms: Increased oil consumption, blue smoke on cold start, bore scoring visible on borescope - !! Water pump / thermostat premature failure from 85,000 km
The MA1.21 (3.4L) runs under higher thermal load than the 2.9L. Water pump failure through bearing or seal wear can lead to localised overheating. Replacement interval of 80,000–100,000 km recommended.
Symptoms: Long warm-up time, coolant loss, squealing from belt drive, coolant temperature rises noticeably in town traffic. - !! High-pressure fuel pump (HPFP) failure from 120,000 km
The DFI high-pressure fuel pump fails and is often unavailable for months. Poor cold starting is the early symptom.
Symptoms: Engine only starts on the third attempt, amber engine warning light, P1024/P1026
+ 5 more engine weaknesses + vehicle weaknesses
Vehicle Weaknesses
| Weakness | Cost | |
|---|---|---|
| Rust on front damper piston rods Damper piston rods at the front axle rust due to stone chip damage. Leaks and MOT/TÜV failures result. Retrofit protective gaiters recommended. Symptoms: Oil weeping from front dampers, knocking over bumps, TÜV defect from 60,000 km | High |
Top Reported Issues
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Known Problems and Issues +
A total of 49 weaknesses have been documented for the Porsche Cayman 987 (2005–2012) — 36 engine-related and 13 vehicle-related. Typical issues affect Suspension, Interior, HVAC, Steering.
Cayman (M97.21, 2005–2009) — Be Careful: Bore Scoring: Cylinder Wall Wear 3.4L, IMS Dual-Row Bearing: Real Failure Risk, Coolant Pipe Housing Cracks. Power: 295 PS.
Cayman (M97.20, 2006–2009) — Be Careful: Bore Scoring: Cylinder Wall Wear Cayman 2.7, IMS Dual-Row Bearing: Real Failure Risk, Coolant Pipe Housing Cracks. Power: 245 PS.
Cayman (MA1.20, 2009–2012) — Be Careful: Bore scoring on Alusil cylinders, High-pressure fuel pump (HPFP) failure, Water pump / thermostat premature failure. Power: 265 PS.
Cayman (MA1.21, 2009–2012) — Be Careful: Bore scoring on Alusil cylinders, Water pump / thermostat premature failure, High-pressure fuel pump (HPFP) failure. Power: 320–325 PS.
Cayman (MA1.21, 2011–2012) — Be Careful: Bore scoring on Alusil cylinders, Water pump / thermostat premature failure, High-pressure fuel pump (HPFP) failure. Power: 325–330 PS.
What to watch out for with the Porsche Cayman? See the detailed listing of all engine and vehicle weaknesses in the sections above.
Frequently Asked Questions
What problems and weaknesses does the Porsche Cayman 987 have? +
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Last updated: February 2026 · All information without guarantee