The 2023 718 Cayman GTS with the 4.0L naturally-aspirated flat-six is largely bulletproof compared to earlier turbocharged 718s, but it's built on the 982 chassis which shares some thermal management and driveline quirks with the GT4. Most severe issues are catastrophic engine failures from IMS-style bearing problems or oil starvation—rare but expensive.
Intermediate Shaft Bearing Failure (IMS-style concern on 4.0L)
Rare · high severityTypical onset: 30,000-60,000 mi
Symptoms: Metallic rattling or knocking from engine bay at cold start, Metal shavings in oil during analysis, Sudden catastrophic engine failure with no warning
Fix: Engine-out service, bearing replacement or full engine rebuild depending on damage. 40-60 hours labor for preventive bearing update; 80-120 hours for full rebuild if grenaded. Many owners do preventive bearing service early.
Estimated cost: $8,000-25,000
Transmission Oil Cooler Line Leaks
Occasional · medium severityTypical onset: 40,000-80,000 mi
Symptoms: Transmission fluid pooling under car after spirited driving, Burning smell from undertray, Low transmission fluid warning on PDK models
Fix: Replace cooler lines and reseal connections. Lines chafe on subframe over time. 3-5 hours labor including fluid refill and bleed procedure.
Estimated cost: $1,200-1,800
Transmission Mount Failure (PDK)
Common · medium severityTypical onset: 50,000-90,000 mi
Symptoms: Clunking when shifting from reverse to drive, Excessive driveline vibration at idle in gear, Visible tearing or separation of rubber mount
Fix: Replace transmission mount assembly. Common on PDK cars with spirited use or track time. 2-3 hours labor, requires lifting transmission slightly.
Estimated cost: $800-1,400
Fuel Filter Clogging (Ethanol-related)
Occasional · medium severitySymptoms: Hesitation or stumbling under hard acceleration above 5,000 RPM, Check engine light with fuel trim codes, Rough idle after track sessions or spirited driving
Fix: Replace in-tank fuel filter and pump assembly. Common with E10+ fuels loosening tank deposits. Requires dropping fuel tank. 4-6 hours labor.
Estimated cost: $1,500-2,200
Head Gasket Seepage (Both Banks)
Occasional · low severityTypical onset: 60,000-100,000 mi
Symptoms: Minor oil seepage visible on cylinder heads, Slight oil consumption increase (within Porsche spec but noticeable), No overheating or coolant loss—cosmetic weeping only
Fix: If caught early, just monitor. If progressing, heads-off service to replace gaskets. 20-30 hours labor for both banks. Many owners live with minor seepage if not losing significant oil.
Estimated cost: $5,000-8,000
Crankshaft Position Sensor Failure
Occasional · high severitySymptoms: Intermittent no-start condition, crank but no fire, Sudden stalling while driving with no warning, Check engine light with crank/cam correlation codes
Fix: Replace crank position sensor. Sensor access requires removing undertray and working around exhaust. 2-3 hours labor. Recommend replacing cam sensor simultaneously as preventive.
Estimated cost: $600-1,000
Buy it—the 4.0L GTS is the sweet spot of the 718 lineup, but budget $2-3k/year for the occasional Porsche tax and get a pre-purchase inspection focused on engine bearing health.
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.