The 2016 718 Cayman S actually uses a 2.5L turbocharged flat-four (350 hp), not the 3.4L flat-six from the 981 generation. This first-year turbo motor has earned a concerning reputation for catastrophic engine failures due to bearing and lubrication issues, with some engines grenading well before 60,000 miles.
Symptoms: Metallic knocking or rattling from engine bay, especially on cold start, Sudden loss of oil pressure warning, Metal shavings in oil during analysis, Complete engine seizure in worst cases
Fix: Requires complete engine rebuild or short block replacement. Root cause appears to be inadequate bearing clearances and oil starvation under high lateral G-loads on track. Porsche issued service bulletin but no recall. Expect 40-60 hours labor for short block swap, plus teardown/diagnosis time.
Estimated cost: $18,000-28,000
Transmission Oil Cooler Failure
Common · medium severity
Typical onset: 40,000-80,000 mi
Symptoms: Transmission fluid leaking from front of car, Transmission overheating warnings on display, Burnt transmission fluid smell, Harsh or delayed shifts when hot
Fix: The PDK transmission oil cooler develops leaks at seals or develops internal cracks. Requires front bumper removal and cooler replacement. Not a DIY job due to PDK fill procedure requiring PIWIS tester. 4-6 hours labor plus fluid flush.
Estimated cost: $1,800-2,800
Transmission Mount Failure
Common · low severity
Typical onset: 50,000-90,000 mi
Symptoms: Clunking when shifting from reverse to drive, Excessive drivetrain movement felt through cabin, Vibration at idle that changes when shifting to gear, Visible tearing or separation of rubber mount
Fix: The rear transmission mount (dogbone mount) wears prematurely, especially with spirited driving. Requires lifting car and supporting transmission. Straightforward job but chassis ears help with alignment. 2-3 hours labor.
Estimated cost: $600-1,000
Fuel Filter Clogging (High-Pressure)
Occasional · medium severity
Typical onset: 60,000-100,000 mi
Symptoms: Hesitation or stumbling under hard acceleration, Intermittent limp mode with fuel system codes (P0087), Difficulty starting when hot, Loss of power above 4,000 RPM
Fix: The turbo 2.5L uses a high-pressure fuel filter that's not listed in standard maintenance schedules but clogs with contaminated fuel. Located under car near fuel tank. Requires fuel system depressurization and sometimes tank lowering for access. 2-3 hours labor.
Estimated cost: $400-700
Turbocharger Wastegate Rattle
Occasional · low severity
Typical onset: 30,000-70,000 mi
Symptoms: Rattling noise from engine on cold start that disappears when warm, Sounds like marbles in a can for 30-60 seconds, No performance loss or check engine light, Noise frequency matches engine RPM
Fix: Wastegate actuator rod develops play in bushings, causing rattle until oil warms and expands parts. Technically a warranty item if caught early. Requires turbocharger removal and actuator replacement or rebuild. 8-12 hours labor per side if both turbos affected.
Estimated cost: $2,500-4,500
Head Gasket Seepage (Turbo Models)
Rare · medium severity
Typical onset: 50,000-80,000 mi
Symptoms: Oil weeping from cylinder head mating surface, Slight oil consumption (1 qt per 2,000 mi), External oil residue on engine blocks, Occasional white smoke on startup
Fix: Some early turbo four-cylinders develop head gasket seepage, likely due to thermal cycling stress. Requires engine removal for proper access in mid-engine layout. Full head gasket job with ARP studs recommended if opening it up. 30-40 hours labor due to engine-out requirement.
Estimated cost: $8,000-12,000
Owner tips
Perform oil analysis every 5,000 miles to catch bearing wear early—look for elevated iron, copper, and aluminum
Avoid extended track sessions without oil cooler upgrades; the turbo 2.5L runs dangerously hot on track
Use only Porsche-approved 0W-40 oil and change every 5,000 miles maximum despite 10k service interval
Pre-purchase inspection MUST include compression test, leak-down test, and bore-scope inspection through spark plug holes
Consider aftermarket engine mounts rated for performance use; OEM mounts are soft and wear quickly with spirited driving
Hard pass unless you have a comprehensive pre-purchase inspection and extended warranty—the bearing failure risk makes this generation a financial gamble that even Porsche enthusiasts avoid.
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.
Fitment notes: Located in front trunk (frunk); AGM required for electronics
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Every control module on the 2016-2017 Porsche 718 Cayman S — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
Transmission Control Unit (TCU)4.5 hr R&Rdealer / factory tool +0.8 hr▸ programming details
📍 Transmission housing, integrated valve body (PDK)
🔧 PIWIS II/III + PPN
⚠️ PDK transmission requires fluid fill and adaptation; manual transmission has no TCU
Electric Power Steering Control Unit (EPS)3.5 hr R&Rdealer / factory tool +0.5 hr▸ programming details
📍 Steering column, integrated with steering rack
🔧 PIWIS II/III
⚠️ Steering angle sensor calibration and wheel alignment required
⚠️ Optional equipment; headlight aim calibration required after replacement
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2016 Porsche 718 Cayman S 3.4L H6 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.