2017 MCLAREN 650S

Typical onset: 20,000-50,000 mi

Symptoms: Transmission overheat warnings on dash, Gear selection delays or harsh shifts, Visible fluid leaks near rear subframe, Burning smell after spirited driving

Fix: The SSG (Seamless Shift Gearbox) oil cooler develops internal leaks or external seepage. Requires removing rear clamshell, dropping transmission partially, and replacing cooler assembly. Genuine McLaren part required. 12-16 labor hours due to access complexity.

Estimated cost: $4,500-7,500

Typical onset: 30,000-70,000 mi

Symptoms: Metallic knocking from engine bay, especially cold start, Low oil pressure warnings intermittently or persistently, Metal debris in oil during changes, Sudden catastrophic failure with no warning in worst cases

Fix: The M838T engine has documented bearing wear issues, particularly main bearings and rod bearings, often linked to oil starvation during hard cornering or inadequate oil change intervals. Repair requires full engine-out service, crankshaft inspection/machining, bearing replacement, sometimes requiring short block replacement if journal damage exists. 40-60 hours labor for complete rebuild, 25-35 hours for bearing replacement if caught early.

Estimated cost: $25,000-55,000

Typical onset: 40,000-80,000 mi

Symptoms: Intermittent 'Transmission Fault' warnings, Refusing to select certain gears (often 3rd or 5th), Stuck in neutral or single gear limp mode, Delayed engagement from standstill

Fix: The Graziano 7-speed dual-clutch transmission uses hydraulic solenoid packs that fail electronically or mechanically. Often requires replacing all solenoids as a set to ensure reliability. Transmission must be dropped or partially removed for access. 10-14 labor hours.

Estimated cost: $5,000-8,500

Typical onset: 50,000-90,000 mi

Symptoms: White smoke from exhaust on startup, Coolant loss with no visible external leaks, Overheating under load, Milky oil or oil in coolant reservoir, Rough idle or misfires

Fix: The M838T develops head gasket leaks, sometimes externally but often internally causing coolant-oil contamination. Requires removing turbos, intake manifolds, and complete head service. Both banks typically done simultaneously to avoid repeat labor. Check for head warpage and deck surface machining. 30-40 labor hours for both banks.

Estimated cost: $18,000-28,000

Typical onset: 25,000-60,000 mi

Symptoms: Excessive clunking during gear changes, Vibration through cabin at idle in gear, Shifter movement feels loose or vague, Visible sagging of transmission when inspected on lift

Fix: Hydraulic and rubber transmission mounts wear from engine torque and heat. Requires rear clamshell removal for access. Replace both mounts as a set. 6-9 labor hours due to access.

Estimated cost: $3,500-5,000

Typical onset: 40,000-70,000 mi

Symptoms: Hesitation or stumbling under hard acceleration, Fuel pressure faults stored in ECU, Limp mode activation under high load, Difficult starting after sitting

Fix: High-pressure fuel filters clog prematurely, particularly with ethanol-blend fuels or contaminated fuel. The in-tank pump pre-filters also degrade. Filter replacement requires fuel system depressurization and tank access. McLaren recommends filter service every 3 years regardless of mileage. 3-5 labor hours.

Estimated cost: $1,200-2,000