2017 PORSCHE 718 CAYMAN S

Typical onset: 30,000-70,000 mi

Symptoms: metallic knocking or ticking from engine bay, especially cold start, sudden oil consumption increase (1+ qt per 1,000 mi), white or blue smoke on startup, loss of compression on cylinder 2 or 3 most commonly, check engine light with misfire codes

Fix: This is a total engine failure requiring either short block replacement (12-18 hours labor) or complete engine rebuild with new pistons, rings, bearings, and bore honing (25-35 hours). Porsche extended warranty coverage to 10 years/120,000 miles for affected VINs, but out-of-warranty cases are financially devastating. Many shops won't attempt in-chassis rebuild due to precision required—recommend factory short block.

Estimated cost: $18,000-28,000

Typical onset: 40,000-80,000 mi

Symptoms: transmission fluid spots under vehicle, left side, low fluid warning on PDK-equipped cars, burnt transmission fluid smell after spirited driving, visible seepage at cooler line connections behind front bumper

Fix: PDK oil cooler lines develop leaks at crimped fittings or rubber sections crack from heat cycling. Requires bumper removal for access, replace both supply and return lines as a set (3-4 hours labor). OEM lines mandatory—aftermarket don't seal properly.

Estimated cost: $800-1,200

Typical onset: 50,000-90,000 mi

Symptoms: clunk when shifting from reverse to drive or vice versa, vibration through chassis at idle in gear, excessive driveline lash during throttle transitions, visible sagging or cracking of rubber mount

Fix: Rear transmission mount deteriorates from heat and vibration, especially on cars driven hard. Access is from underneath, requires transmission support (2-3 hours labor). Upgrade to aftermarket solid or polyurethane mount is common modification during replacement.

Estimated cost: $400-700

Symptoms: rough idle or misfires under load, loss of power above 4,000 rpm, extended cranking before start, lean fuel trim codes (P0171/P0174), fuel pressure lower than 58 psi spec

Fix: In-tank fuel filter assembly clogs prematurely with ethanol-blend fuels, particularly E15 or higher. Requires fuel tank drop (4-5 hours labor). Replace entire fuel pump/filter module assembly—filter is not serviceable separately. Use only Top Tier gas to prevent recurrence.

Estimated cost: $1,200-1,800

Typical onset: 20,000-60,000 mi

Symptoms: rattling sound from engine bay between 1,800-2,500 rpm under light load, sound disappears under acceleration or at idle, no performance loss or codes, most noticeable in 3rd-4th gear cruise

Fix: Wastegate actuator rod develops play in bushing, causing characteristic rattle. Porsche issued updated turbochargers with revised actuators under warranty for many cases. Requires turbo removal for actuator replacement or full turbo swap (8-10 hours labor per side if both affected). Does not affect reliability but annoying.

Estimated cost: $2,500-4,000

Typical onset: 60,000-100,000 mi

Symptoms: coolant smell in cabin or under hood, visible coolant seepage at tank seams, low coolant warning light, steam from rear engine bay after shutdown, coolant level drops without external leaks visible

Fix: Plastic expansion tank develops stress cracks at mounting tabs or seams from heat cycling. Tank is buried behind left rear wheel liner. Requires wheel removal and liner drop (2-3 hours labor). Replace tank, cap, and system flush. Inspect all coolant hoses while accessible.

Estimated cost: $600-900