2001 PORSCHE 718 BOXSTER

Typical onset: 40,000-80,000 mi

Symptoms: metallic rattling on cold start, metal shavings in oil filter, sudden catastrophic engine failure with no warning in some cases, check engine light with cylinder misfire codes

Fix: IMS bearing replacement requires dropping the transmission and splitting the engine case or doing a retrofit with the single-row bearing upgrade. Most shops recommend doing clutch, rear main seal, and AOS while you're in there. 18-25 labor hours depending on approach. If it grenades, you're looking at full engine rebuild or replacement.

Estimated cost: $2,500-4,000 for preventive replacement; $8,000-15,000 for engine rebuild after failure

Typical onset: 60,000-100,000 mi

Symptoms: blue smoke on startup, excessive oil consumption (1 qt per 500-1000 mi), rough idle when warm, loss of compression in one or more cylinders, visible scoring marks on bore walls during borescope inspection

Fix: Cylinder liners score due to inadequate lubrication and Lokasil coating failure. No fix except engine rebuild with Nickies sleeves or LN Engineering sleeves, or replacement with a rebuilt unit. 30-40 labor hours for full tear-down and rebuild.

Estimated cost: $10,000-18,000 for proper rebuild with upgraded liners

Typical onset: 50,000-90,000 mi

Symptoms: excessive oil consumption without visible leaks, smoke from exhaust on deceleration, oil in intake plenum or throttle body, rough idle, check engine light with lean/rich codes

Fix: The AOS diaphragm tears and allows crankcase pressure to pull oil into the intake. Replacement requires removing intake manifold and associated components. Often done during IMS bearing job. 4-6 labor hours standalone.

Estimated cost: $800-1,400

Typical onset: 60,000-120,000 mi

Symptoms: oil drips on garage floor behind engine, oil coating on flywheel/clutch visible from below, oil smell in cabin when parked on incline, puddle forms after sitting overnight

Fix: The RMS develops a leak due to age and heat cycles. Requires transmission drop, flywheel removal, and seal replacement. Almost always done in conjunction with IMS bearing or clutch work due to access requirements. 8-12 labor hours standalone.

Estimated cost: $1,200-2,000 standalone; $300-500 parts if done during other work

Typical onset: any mileage (age-related)

Symptoms: coolant smell in cabin, coolant puddles under car, overheating warnings, visible cracks in plastic expansion tank, soft/spongy coolant hoses near headers

Fix: Plastic expansion tank becomes brittle and cracks; coolant hoses deteriorate from heat exposure. Tank is easy access but hoses in some locations require removing undertray and side panels. 2-4 labor hours depending on which hoses need replacement.

Estimated cost: $400-900

Typical onset: any mileage (age-related)

Symptoms: top operates slowly or unevenly, hydraulic fluid leaks visible in trunk area, top gets stuck mid-cycle, whining noise from hydraulic pump, manual release required to operate top

Fix: Hydraulic lines crack, pump seals fail, or rams develop leaks. Diagnosis requires pressure testing the system. Individual component replacement ranges from 2-6 hours depending on which part fails. Full system overhaul can take 8-10 hours.

Estimated cost: $600-2,500 depending on component