2018 PORSCHE CAYENNE GTS

Typical onset: 60,000-100,000 mi

Symptoms: White smoke from exhaust on cold start, Coolant loss with no external leaks, Rough idle or misfires, Milky oil or coolant in expansion tank turning oily

Fix: Requires head gasket replacement minimum, but often progresses to full engine rebuild or short block replacement if coolant has damaged bearings. 25-40 hours labor depending on extent of damage. Many shops recommend full short block at this point to avoid repeat failure.

Estimated cost: $8,000-$18,000

Typical onset: 70,000-120,000 mi

Symptoms: Knocking or ticking noise from lower engine, especially when cold, Metal shavings in oil during changes, Low oil pressure warnings, Sudden catastrophic failure if driven with noise

Fix: Bearing replacement requires full engine disassembly. Most techs recommend short block replacement or complete rebuild with updated bearings and clearances. 30-45 hours labor. Often triggered by extended oil change intervals or coolant contamination.

Estimated cost: $12,000-$22,000

Typical onset: 50,000-90,000 mi

Symptoms: Transmission fluid dripping from bellhousing area, Low transmission fluid warnings, Burnt smell from under vehicle, Harsh or delayed shifts if fluid level drops significantly

Fix: Oil cooler and lines need replacement. Requires partial transmission drop or significant disassembly for access. 6-9 hours labor. Flush and refill transmission fluid while you're in there.

Estimated cost: $1,800-$3,200

Typical onset: 60,000-100,000 mi

Symptoms: Clunking when shifting from Park to Drive/Reverse, Excessive vibration at idle in Drive, Visible transmission sag or movement during acceleration

Fix: Replace transmission mount. Requires supporting transmission and engine during removal. 2-3 hours labor. Replace both engine and transmission mounts together for best results.

Estimated cost: $600-$1,200

Symptoms: Rough running or hesitation under load, Extended cranking before start, Loss of power at higher RPMs, Fuel system pressure faults

Fix: Replace high-pressure fuel filter assembly. Located in fuel system that requires depressurization and proper tools. 2-3 hours labor. Often overlooked in maintenance schedules but critical on direct-injection turbo engines.

Estimated cost: $800-$1,400

Typical onset: 80,000-130,000 mi

Symptoms: Rattling noise on cold start that disappears when warm, Overboost or underboost fault codes, Reduced power and limp mode, Turbo whistle or abnormal sounds under boost

Fix: Wastegate actuators fail or carbon buildup causes sticking. Often requires turbocharger removal and rebuild or replacement. 8-12 hours labor per side (two turbos). Catch early before turbine damage occurs.

Estimated cost: $3,500-$6,500