2005 PORSCHE 718 BOXSTER

Typical onset: 60,000-100,000 mi

Symptoms: metallic rattling on cold start, metal shavings in oil filter, sudden loss of oil pressure, catastrophic engine failure without warning

Fix: Requires engine-out service to replace IMS bearing preemptively (8-12 hours) or full engine rebuild if it's already failed (40-60 hours). Most owners do preventive replacement during clutch jobs. If it grenades, you're looking at used engine swap or full rebuild with all internals.

Estimated cost: $2,500-4,000 preventive; $12,000-18,000 post-failure rebuild

Typical onset: 80,000-120,000 mi

Symptoms: excessive oil consumption (1 qt per 1,000 mi), blue smoke on startup, loss of compression, rough idle when warm, eventually misfires and loss of power

Fix: M96 engines with Lokasil cylinder linings wear prematurely, especially cylinders 4 and 7. Requires bore scoring inspection with borescope. Fix is engine-out, cylinder replating or sleeving, new pistons and rings. Some opt for used engine swap instead. 50-70 hours all-in for proper rebuild.

Estimated cost: $10,000-16,000

Typical onset: 70,000-110,000 mi

Symptoms: oil pooling under car after sitting, oil spots on driveway, oily residue on bottom of transmission bell housing, low oil level between changes

Fix: The RMS on M96 engines fails predictably. Engine or transmission must come out for access (most do it during IMS bearing service or clutch replacement to save labor). Seal itself is cheap, labor is 10-14 hours if done alone.

Estimated cost: $1,800-3,000 standalone; $400-600 parts/labor added to clutch or IMS job

Typical onset: 60,000-100,000 mi

Symptoms: coolant smell in cabin, visible coolant leak driver-side engine bay, low coolant warning light, overheating if ignored

Fix: Plastic tank develops stress cracks at mounting tabs and seams. Replace tank and pressure-test system. Check hoses while you're in there. 1.5-2.5 hours labor.

Estimated cost: $300-550

Symptoms: top moves slowly or stops mid-cycle, whining hydraulic pump, fluid leaks at cylinders or lines, top won't latch or unlatch

Fix: Hydraulic lines, cylinders, or pump fail. Diagnosis takes time—could be micro-switches, lines, or pump motor. Cylinders are 3-4 hours each side, pump is 2-3 hours. Entire system overhaul can run 8-12 hours if multiple components are shot.

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

Typical onset: 70,000-100,000 mi

Symptoms: excessive oil consumption, oil in intake tubes, white smoke from exhaust, rough idle, check engine light with lean codes

Fix: AOS diaphragm tears, allowing crankcase pressure to push oil into intake. Replace AOS unit and check for oil-soaked intake tubes. 3-5 hours labor depending on how many intake components need cleaning.

Estimated cost: $800-1,400

Typical onset: 80,000-120,000 mi

Symptoms: clunking on hard acceleration or deceleration, excessive drivetrain movement, vibration at idle, visible torn rubber on mounts

Fix: Mounts wear from age and heat. Transmission mount is notorious. Replace all mounts while you're in there—engine has multiple. 2-4 hours total labor for full set.

Estimated cost: $600-1,200