Porsche S · Coupé
The 2.5T four-cylinder boxer in the S variants is a step up from the 2.0T — more displacement means less turbo pressure needed, the pull is fuller, and the spread between part-load and full-load feels less artificial. Still: sonically the engine remains a compromise. The 2.5T cooling system has its own weakness in the form of changeover valves that can fail prematurely without obvious coolant loss — diagnosis is tedious. Turbo oil feed lines can leak and set up bearing damage. Buying the S means primarily buying the better suspension calibration and higher torque — the engine is a means to an end, not a soul.
Cayman S: Almost Complete
The Cayman S with manual comes close to what you expect from a mid-engine sports car: direct suspension, 350 hp at your fingertips, shifting yourself. What's missing is the sound. Those who know the Cayman 981 naturally aspirated engine as a reference know what's been lost. Those without that reference in direct comparison have a great time.
Engine Weaknesses 6
Wastegate actuator can seize or fail. Porsche dealers diagnosed seized actuators that were fixed by lubrication — sometimes replacement was necessary. Can trigger limp mode.
Symptoms: Metallic rattle at around 2,700 rpm, power loss, limp mode, boost pressure fault.
Overdue spark plugs can seize in the aluminium heads of the 2.5T engine. Turbo-related heat cycles accelerate the baking-in. Thread damage can require cylinder head repair.
Symptoms: Misfires, rough running, fault codes for individual cylinders, difficulty removing plugs.
Thermal switching valves in the cooling circuit fail prematurely. Similar vacuum issues as on the 2.0T. A symptomatic diagnostic drive is required.
Symptoms: Cooling system fault warning, irregular temperature development, workshop alert without visible coolant loss
Leaking turbo oil pressure lines documented. Oil loss can lead to inadequate oil supply to the turbo bearings and cause bearing damage.
Symptoms: Oil smell in engine bay, oil spots under the car, smoke development from hot engine
Coolant expansion tank develops thermal hairline cracks — on the 2.5T aggravated by the greater heat input of the larger turbo. Replacement requires extensive engine surround disassembly.
Symptoms: Coolant warning light, sweet smell after driving, occasional coolant level drop without visible puddle.
Same as the 2.0T: pure direct injection accumulates oil mist residue on the intake valves. No port injection to counteract it.
Symptoms: Rough cold-start idle, sporadic stumble in part-throttle range, slight power drop
Vehicle Weaknesses 7
PCM 4.0 infotainment system shuts itself down while driving. Software updates do not provide a permanent fix.
After brake disc or spring replacement, ABS and PSM warning lights come on. A software reset or vehicle scan resolves the issue.
Drain holes in the front luggage compartment and below the windscreen clog with leaves and dirt. Water entering damages ECUs and electrical components in the front trunk.
PASM switch and associated control electronics fail intermittently. Suspension does not respond to mode changes.
Faulty active engine mounts send incorrect signals to the PASM control unit. PASM deactivates and stays in soft mode.
The proximity to the mid-mounted engine transfers more vibration than in the 911. Dashboard, centre console and glovebox creak. The four-cylinder generates more structure-borne noise at certain engine speeds.
The AC condensers sit exposed behind the front bumper and are vulnerable to stone damage. Slow refrigerant loss announces itself through declining cooling performance, eventually leading to complete AC failure.
