The 2013 Boxster (981 chassis, not 718—the 718 name came in 2016) with the 2.7L flat-six is generally reliable, but suffers from the IMS bearing legacy concern (though less so than 996/997 era), and critically, the direct-injection M97 engines are prone to bore scoring and cylinder scoring that can necessitate complete engine rebuilds.
Cylinder Bore Scoring / Localized Cylinder Wall Wear
Occasional · high severityTypical onset: 60,000-100,000 mi
Symptoms: Cold-start smoke (blue/white) that clears after warmup, Increased oil consumption (more than 1 qt per 1,000 mi), Rough idle when cold, smooths out at operating temp, Metal flakes in oil filter or on magnetic drain plug
Fix: Complete engine rebuild with cylinder re-sleeving or replacement (Lokasil liner replacement by LN Engineering or similar), new pistons, rings, bearings. Typically 40-60 labor hours depending on removal method and machine shop turnaround. Some opt for factory short block replacement to avoid re-sleeving gamble.
Estimated cost: $12,000-22,000
IMS Bearing Failure (Intermediate Shaft)
Rare · high severityTypical onset: 50,000-80,000 mi
Symptoms: Metallic rattling from engine bay at idle, Metal shavings in oil, Sudden catastrophic engine failure with knocking, Check engine light with cylinder misfire codes
Fix: Engine removal, IMS bearing replacement with upgraded aftermarket unit (LN Engineering, Flat 6 Innovations). Often done preemptively during clutch or RMS replacement. If bearing has failed, expect full teardown to assess crank/case damage. 20-30 hours if caught early; full rebuild if grenaded.
Estimated cost: $3,500-6,000 preventive; $15,000+ if failed
Rear Main Seal (RMS) Oil Leak
Common · medium severityTypical onset: 70,000-120,000 mi
Symptoms: Oil drips on garage floor behind engine/trans area, Oil residue on bellhousing or clutch area, Low oil level warnings despite no visible external leaks elsewhere
Fix: Engine or transmission removal required for access. Seal replacement itself is straightforward, but labor is heavy due to access. Smart owners bundle this with IMS bearing service and clutch replacement. 18-25 hours labor if done alone.
Estimated cost: $2,200-3,800
Transmission Oil Cooler Line Leaks
Occasional · medium severityTypical onset: 80,000-110,000 mi
Symptoms: Transmission fluid spots under car (red or brown fluid), Burnt transmission smell after highway driving, Slipping or delayed shifts when hot, Low trans fluid level on dipstick
Fix: Replace oil cooler lines and often the cooler itself due to corrosion at fittings. Lines run along chassis rails and can chafe. 4-6 hours labor for lines; add 2-3 hours if cooler needs replacement.
Estimated cost: $800-1,500
Engine and Transmission Mount Deterioration
Common · low severityTypical onset: 60,000-90,000 mi
Symptoms: Clunking when shifting or throttle tip-in, Excessive vibration at idle in cabin, Visible sagging or cracking of rubber bushings on inspection
Fix: Replace engine mounts (typically two front, one rear) and transmission mount. Straightforward job but requires lifting engine/trans slightly for access. 6-8 hours total labor.
Estimated cost: $1,200-2,000
Direct Injection Carbon Buildup on Intake Valves
Occasional · medium severityTypical onset: 80,000-120,000 mi
Symptoms: Rough idle and misfires (especially cylinders 4-6), Loss of power and throttle response, Check engine light with misfire codes P0300-P0306, Failed emissions testing
Fix: Walnut blasting of intake valves requires intake manifold removal and manual cleaning of each port. 8-12 hours labor depending on tech experience. Prevention: occasional Italian tune-up and quality fuel.
Estimated cost: $1,000-1,800
Buy one only if bore scoring has been ruled out via inspection and IMS/RMS are documented as done—otherwise budget $15k+ for eventual engine work; when healthy, they're sublime drivers.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.