2003 PORSCHE 718 BOXSTER

Typical onset: 40,000-80,000 mi

Symptoms: Metallic rattling on cold start that disappears when warm, Metal shavings in oil filter during changes, Sudden catastrophic engine failure with no warning, Check engine light with cam/crank correlation codes

Fix: Requires engine removal, transmission split, flywheel removal, and IMS bearing replacement with upgraded dual-row bearing. Many owners do this preventatively with clutch replacement. 18-24 labor hours for IMS upgrade alone; if the bearing has already failed and damaged the engine, you're looking at full engine rebuild or replacement.

Estimated cost: $3,500-6,000 preventative replacement; $12,000-18,000 if engine rebuild required

Typical onset: 60,000-100,000 mi

Symptoms: Blue smoke on startup that clears after warm-up, Oil consumption exceeding 1 quart per 1,000 miles, Loss of compression in cylinders 4-6, Rough idle when cold, Failed emissions test due to excessive hydrocarbons

Fix: Borescope inspection reveals scoring on cylinder walls, typically rear bank. Only fix is complete engine rebuild with Nikasil cylinder liners or LN Engineering sleeves, new pistons, rings, bearings. 35-45 labor hours minimum. Some opt for used engine swap instead.

Estimated cost: $15,000-22,000 rebuild; $8,000-12,000 used engine swap

Typical onset: 50,000-90,000 mi

Symptoms: Oil dripping from bell housing area onto ground, Oil spots on driveway after parking, Oil coating on flywheel visible through inspection hole, Burning oil smell after highway driving

Fix: Requires transmission removal to access rear main seal. Most shops recommend doing IMS bearing and clutch at same time since you're already in there. Seal replacement alone is 10-12 labor hours.

Estimated cost: $1,800-2,800 seal only; $4,500-7,000 if combined with IMS and clutch

Typical onset: 15+ years regardless of mileage

Symptoms: Coolant smell in cabin or engine bay, Visible coolant leak from passenger side of engine bay, Low coolant warning light, Overheating in severe cases, Brittle plastic tank with cracks visible

Fix: Plastic expansion tank becomes brittle and cracks; coolant hoses also deteriorate. Replace tank and all coolant hoses preventatively. 3-4 labor hours for tank and hose refresh.

Estimated cost: $600-1,200

Symptoms: Convertible top slow to open or close, Top stops mid-cycle and won't complete operation, Hydraulic fluid leak visible near top mechanism, Clunking noise during top operation, Top operates but doesn't latch properly

Fix: Hydraulic cylinders develop leaks or pump fails. Microswitch failures also common. Diagnosis 1-2 hours, cylinder replacement 4-6 hours depending on which cylinder. Pump replacement 3-4 hours.

Estimated cost: $800-2,500 depending on component

Typical onset: 70,000-120,000 mi

Symptoms: Excessive oil consumption without visible leaks, Oil in intake manifold or throttle body, White smoke from exhaust on deceleration, Rough idle, Check engine light with lean/rich codes

Fix: AOS diaphragm ruptures, allowing crankcase pressure to push oil into intake. Located under intake manifold. 6-8 labor hours to replace due to access issues.

Estimated cost: $1,200-1,800