The 2008 Cayman (987.1 generation) with the 2.7L M97 engine is a brilliant handling platform plagued by intermediate shaft (IMS) bearing failures and direct-injection successor bore scoring issues—though the 2.7L is far less prone to scoring than the 3.4L. The transmission and cooler design also presents recurrent headaches.
IMS Bearing Failure (M97 Engine)
Occasional · high severityTypical onset: 40,000-80,000 mi
Symptoms: Metallic debris in oil during changes, Rattling or knocking from engine bay at startup, Catastrophic engine failure without warning in worst cases
Fix: Requires engine-out service to replace IMS bearing preventively or full engine rebuild if bearing has already disintegrated. Preventive replacement: 16-20 hours labor. Post-failure: 40-60 hours for complete rebuild including all bearings, gaskets, and often pistons/cylinders.
Estimated cost: $3,500-6,000 preventive; $15,000-25,000 post-failure rebuild
Cylinder Bore Scoring (Less Common in 2.7L)
Rare · high severityTypical onset: 60,000-100,000 mi
Symptoms: Excessive oil consumption (more than 1 qt per 1,000 mi), Blue smoke on cold starts, Loss of compression in one or more cylinders, Rough idle and misfires
Fix: Requires complete engine teardown, cylinder re-sleeving or replacement, new pistons and rings. The 2.7L sees this far less than the 3.4L DFI engines, but it still happens. 45-55 hours labor for full short-block work.
Estimated cost: $12,000-18,000
Transmission Oil Cooler Line Failure
Common · medium severityTypical onset: 70,000-120,000 mi
Symptoms: Transmission fluid leaking near front of vehicle, Burnt transmission fluid smell, Slipping or delayed shifts when fluid gets low, Puddles under car after parking
Fix: The rubber lines from transmission to cooler crack and leak. Requires replacement of cooler lines and often the cooler itself if contaminated. 4-6 hours labor including fluid flush.
Estimated cost: $800-1,400
Transmission Mount Failure
Common · low severityTypical onset: 60,000-100,000 mi
Symptoms: Clunking when shifting, especially into reverse, Vibration through chassis under acceleration, Visible sagging or cracking of rubber mount
Fix: The rear transmission mount tears due to the mid-engine layout stressing it during hard acceleration. Replacement is straightforward: support transmission, unbolt old mount, install new. 2-3 hours labor.
Estimated cost: $400-700
Coolant Expansion Tank Cracking
Occasional · medium severityTypical onset: 80,000-120,000 mi
Symptoms: Coolant level dropping with no visible external leaks initially, Sweet smell in cabin or engine bay, Visible cracks in plastic tank, often at seams, Overheating if ignored long enough
Fix: The plastic expansion tank becomes brittle and cracks. Tank replacement plus system flush and bleed. 2-3 hours labor. Catch it early before it leaves you stranded.
Estimated cost: $350-600
Water Pump Failure
Occasional · medium severityTypical onset: 70,000-110,000 mi
Symptoms: Squealing or grinding noise from engine bay, Coolant leak from pump housing, Overheating, Check engine light with coolant temp codes
Fix: The electric water pump or mechanical pump (depending on model year specifics for auxiliary systems) fails. Replacement involves coolant drain, pump swap, refill and bleed. 3-5 hours labor. Do thermostat at same time.
Estimated cost: $600-1,100
Air-Oil Separator (AOS) Failure
Common · medium severityTypical onset: 50,000-90,000 mi
Symptoms: Excessive oil consumption without visible leaks, White or blue smoke from exhaust on deceleration, Oil in intake tract or throttle body, Rough idle due to vacuum leak
Fix: The AOS diaphragm tears, allowing oil to be sucked into intake and creating vacuum leaks. Requires AOS replacement and intake cleaning. 4-6 hours labor due to mid-engine access constraints.
Estimated cost: $800-1,300
Buy a 2.7L 987.1 Cayman if IMS bearing has been addressed or you budget for it immediately, but only with thorough PPI and maintenance records—otherwise you're gambling with a $15k engine rebuild.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.