2008 PORSCHE 718 BOXSTER S

Typical onset: 40,000-80,000 mi

Symptoms: Metallic debris in oil during changes, Sudden engine rattling or knocking from the rear of engine, Catastrophic engine failure with no prior warning in some cases, Oil leaks from rear main seal area as bearing disintegrates

Fix: Requires engine removal, complete teardown to replace IMS bearing, and inspection of all internal damage. If bearing has failed completely, expect full engine rebuild or replacement. Typical labor 18-25 hours for preventive replacement, 35-50 hours if rebuilding after failure.

Estimated cost: $3,500-6,000 preventive replacement; $15,000-25,000 post-failure rebuild or used engine swap

Typical onset: 60,000-100,000 mi

Symptoms: Excessive oil consumption (quart every 500-1,000 miles), Blue smoke on cold starts that persists longer than 30 seconds, Loss of compression in one or more cylinders, Rough idle and misfires as scoring progresses, Metallic debris visible in oil filter

Fix: Cylinder walls lose their Lokasil coating due to design flaw and running conditions. Requires complete engine disassembly, bore inspection, and either cylinder replating/sleeving or short block replacement. Many opt for factory-rebuilt engine with updated Alusil cylinders. Labor 30-45 hours.

Estimated cost: $12,000-22,000 for full engine rebuild with upgraded cylinders or replacement long block

Typical onset: 50,000-90,000 mi

Symptoms: Oil puddles under center-rear of car after sitting overnight, Oil coating on flywheel housing visible from underneath, Burning oil smell after spirited driving, Drops on garage floor between transmission and engine

Fix: Requires transmission and flywheel removal to access rear main seal. Often done in conjunction with IMS bearing service or clutch replacement to save on duplicate labor. 8-12 hours labor standalone, 3-4 hours incremental if transmission already out.

Estimated cost: $1,500-2,800 standalone; $400-800 if combined with transmission-out work

Typical onset: 70,000-120,000 mi

Symptoms: Coolant smell in engine bay, especially when hot, Visible coolant weeping from tank seams or mounting tabs, Low coolant warning light with no external leaks visible, Cracks visible in plastic tank, often at mounting points

Fix: Plastic tank becomes brittle with heat cycles. Direct replacement is straightforward but requires coolant drain and system bleeding. Upgraded aluminum tanks available. 1.5-2.5 hours labor.

Estimated cost: $350-700 with OEM plastic tank; $600-1,000 with upgraded aluminum tank

Typical onset: 60,000-100,000 mi

Symptoms: Squealing or grinding noise from front of engine bay, Coolant leak from front-center underside, Overheating under load or in traffic, Wobbly pulley visible when engine running

Fix: Water pump bearings fail or impeller breaks. Requires front bumper removal for access, drain coolant, replace pump and thermostat as a set. Also replace accessory belts while in there. 3-5 hours labor.

Estimated cost: $800-1,400

Typical onset: 70,000-110,000 mi

Symptoms: Excessive drivetrain clunk when shifting or during acceleration/deceleration, Vibration at idle that worsens with A/C on, Visible torn rubber or fluid leaking from hydraulic mounts, Shifter feels loose or imprecise

Fix: Hydraulic engine and transmission mounts deteriorate from heat and age. Typical to replace both engine mounts and transmission mount as a set. Requires lifting powertrain slightly. 4-6 hours labor for all three mounts.

Estimated cost: $1,200-2,000 for all mounts

Typical onset: 60,000-100,000 mi

Symptoms: White smoke from exhaust under acceleration, Oil in intake system or throttle body, Rough idle with P0171/P0174 lean codes, Excessive oil consumption without external leaks, Check engine light with multiple misfires

Fix: AOS diaphragm fails, allowing oil to be sucked into intake manifold and creating vacuum leaks. Located under intake manifold on passenger side. Requires intake removal. Replace AOS and clean intake system. 4-6 hours labor.

Estimated cost: $900-1,600