The 2017 718 Boxster with the 2.0L turbo flat-four (base engine) is a controversial departure from Porsche's naturally-aspirated heritage, and unfortunately it came with a catastrophic flaw: chronic cylinder scoring and premature engine failure that can strike well before 60,000 miles in severe cases.
Catastrophic Cylinder Scoring / Engine Failure (2.0L Turbo)
Occasional · high severityTypical onset: 30,000-70,000 mi
Symptoms: Excessive oil consumption (1 qt per 1,000 mi or worse), Blue smoke on cold start or under acceleration, Loss of compression, misfires, rough idle, Metallic rattling from engine, especially when cold
Fix: Complete engine rebuild or replacement required. Pistons, cylinder walls, rings, often crankshaft and bearings all affected. 40-60 hours labor for full rebuild, 25-35 hours for short block swap. Porsche extended warranty to 10yr/120k mi on affected engines but only covers specific failure modes—many owners still fight for coverage.
Estimated cost: $15,000-25,000
Transmission Oil Cooler Failure
Common · medium severityTypical onset: 40,000-80,000 mi
Symptoms: Transmission fluid leaking near front of car, Transmission overheating warnings on track or spirited driving, Burnt transmission fluid smell, Erratic shifting or delayed engagement when hot
Fix: Oil cooler develops leaks at crimp joints or internal failures. Must drop subframe for access on PDK models. 8-12 hours labor including fluid flush and refill with expensive Porsche PDK fluid.
Estimated cost: $2,200-3,800
Transmission Mount Failure
Common · low severityTypical onset: 50,000-90,000 mi
Symptoms: Clunking when shifting from Park to Drive or Reverse, Excessive driveline vibration at idle in gear, Visible sagging or torn rubber on mount inspection, Harsh engagement during aggressive launches
Fix: The rear transmission mount tears or separates. Relatively straightforward replacement but requires lifting transmission slightly. 3-4 hours labor.
Estimated cost: $800-1,200
Fuel System Hose/Line Deterioration
Occasional · high severitySymptoms: Fuel smell in cabin or around engine bay, Fuel pooling under vehicle, Check engine light with fuel system pressure codes, Hard starting or fuel starvation under load
Fix: NHTSA recall addressed some fuel line issues, but additional lines and quick-connect fittings in the rear engine bay continue to crack or leak, especially in hot climates. Diagnosis can be time-consuming due to shielding. 4-8 hours labor depending on which lines fail.
Estimated cost: $1,200-2,500
PDK Clutch Pack Wear (High-Performance Use)
Rare · high severityTypical onset: 60,000-100,000 mi
Symptoms: Slipping during hard acceleration or Launch Control, Shuddering when pulling away from stop, Burnt smell from transmission, Transmission fault codes for clutch slip
Fix: Primarily affects cars with frequent track use or Launch Control abuse. Requires transmission removal and complete clutch pack replacement. 18-24 hours labor plus expensive Porsche parts.
Estimated cost: $8,000-12,000
Convertible Top Hydraulic System Leaks
Occasional · low severityTypical onset: 60,000-100,000 mi
Symptoms: Slow or incomplete top operation, Hydraulic fluid spots in rear trunk area, Top error messages on dash, Creaking or uneven movement during cycle
Fix: Hydraulic rams, hoses, or pump seals leak. Can sometimes be addressed with seal kits, but often requires component replacement. Diagnosis and repair 4-8 hours labor. Prevention: cycle the top regularly even in winter.
Estimated cost: $1,500-3,500
The 2.0L turbo engine's scoring issues make this a high-risk used buy unless you have documented evidence of a factory engine replacement or can secure an extended warranty—otherwise, budget for a potential $20k engine job.
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.