2006 PORSCHE 718 CAYMAN

Typical onset: 40,000-80,000 mi

Symptoms: Metallic debris in oil during changes, Sudden catastrophic engine failure with no prior warning, Rough idle or knocking if bearing is disintegrating, Oil leaks from rear main seal area as bearing deteriorates

Fix: Preventive IMS bearing replacement requires transmission drop, clutch/flywheel out, and retrofit of upgraded bearing (LN Engineering or similar). Takes 12-16 hours. If it fails, you're looking at complete engine rebuild or replacement. Many owners do this preemptively around 50k-60k mi if no service history exists.

Estimated cost: $2,500-3,500 preventive retrofit; $15,000-25,000 full engine rebuild after failure

Typical onset: 60,000-100,000 mi

Symptoms: Blue smoke on cold start that clears after warmup, Increased oil consumption (more than 1 qt per 1,000 mi), Loss of compression in one or more cylinders, Rough running and misfires as scoring worsens

Fix: Bore scoring requires complete engine teardown, Nikasil cylinder replating or sleeving, new pistons/rings. Some opt for used/rebuilt engine swap instead. 40-60 hours labor for in-chassis rebuild. Early 2.7s less affected than 3.4, but still occurs.

Estimated cost: $12,000-20,000 rebuild; $8,000-12,000 used engine swap

Typical onset: 50,000-90,000 mi

Symptoms: Oil spots under car after parking, Oil weepage visible at engine/transmission junction, Slow oil level drop between changes, Sometimes mistaken for IMS bearing leak

Fix: Transmission must come out to access RMS. Often done during IMS bearing service or clutch replacement to save on repeat labor. 10-14 hours standalone. Seal itself is cheap, labor is the killer.

Estimated cost: $1,800-2,800 standalone; add $200-300 if done during clutch/IMS work

Typical onset: 70,000-120,000 mi

Symptoms: Coolant smell in engine bay or cabin, Visible coolant drips under right side of car, Low coolant warning light, Cracks visible on plastic expansion tank near mounting tabs

Fix: Plastic tank becomes brittle with heat cycles. Replacement is straightforward: drain coolant, remove airbox and undertray for access, swap tank, bleed system. 2-3 hours. Use OEM or high-quality aftermarket; cheap parts crack again quickly.

Estimated cost: $400-700

Typical onset: 60,000-100,000 mi

Symptoms: Clunking on shifts or throttle application, Excessive driveline vibration at idle in gear, Visible torn rubber or fluid leakage from hydraulic mounts, Shifter slop or imprecise gear engagement

Fix: Typical to replace all three mounts (left/right engine, transmission). Access is tricky on the mid-engine layout. 4-6 hours for the set. OEM mounts are hydraulic-filled; aftermarket solid mounts increase NVH but last longer.

Estimated cost: $800-1,400

Symptoms: Fuel gauge reads empty when tank has fuel, Erratic gauge movement or stuck at full, Inaccurate range-to-empty calculations, Sometimes intermittent, gets worse over time

Fix: Fuel sender unit in tank fails due to solder joint cracks on circuit board. Requires fuel tank drop or removal. Can repair circuit board or replace entire sender assembly. 3-5 hours labor.

Estimated cost: $500-900