2013 BENTLEY FLYING SPUR

Typical onset: 60,000-100,000 mi

Symptoms: rough idle progressing to misfires, loss of power under boost, metal shavings in oil, check engine light with multiple cylinder misfire codes, catastrophic knock leading to spun bearings

Fix: The W12's direct injection creates severe carbon buildup on intake valves, causing hot spots and pre-ignition that can crack pistons or damage rings. Once detonation starts, connecting rod bearings fail quickly. Full engine rebuild requires 80-120 hours: block removal, pistons, rings, bearings, gaskets, plus walnut blasting intake valves. Many shops won't touch it—expect specialist pricing.

Estimated cost: $25,000-45,000

Typical onset: 70,000-110,000 mi

Symptoms: transmission slipping or harsh shifts, milky or contaminated transmission fluid, coolant in transmission pan, limp mode activation, complete transmission failure if driven after contamination

Fix: The integrated oil cooler inside the transmission can rupture internally, allowing coolant and ATF to mix. This destroys clutch packs and solenoids within miles. Requires transmission removal (18-24 hours), complete rebuild or replacement, plus flushing all cooler lines. Prevention means replacing the cooler proactively around 60k-70k miles.

Estimated cost: $8,000-15,000

Typical onset: 50,000-80,000 mi

Symptoms: clunking when shifting from park to drive, vibration during acceleration, visible sagging of transmission when inspected on lift, harsh engagement into gear

Fix: The hydraulic transmission mount fails due to heat from the W12 and fluid leakage. Requires supporting the drivetrain and replacing the mount assembly (4-6 hours). OEM part is expensive but aftermarket options often fail prematurely. Should be done with subframe inspection.

Estimated cost: $1,200-2,200

Typical onset: 80,000-120,000 mi

Symptoms: delayed or erratic shifting, slipping between gears, check engine light with transmission codes, stuck in single gear or limp mode

Fix: The solenoid valve body assembly wears internally or fails electrically. Requires dropping the transmission pan, replacing all solenoids as a set, new ATF, and adaptive reset (8-12 hours). Often done preventatively during oil cooler replacement to avoid repeat transmission-out labor.

Estimated cost: $2,500-4,500

Symptoms: rough running especially under load, hesitation during acceleration, check engine light with fuel trim or pressure codes, hard starting when hot

Fix: The in-tank fuel filter isn't a regular service item in owner manuals but clogs by 40k-60k miles, starving the high-pressure direct injection pumps. Requires fuel tank drop (6-8 hours) to access filter and pump assembly. Bentley doesn't sell filter separately—must replace entire pump module. Failure to replace can kill expensive HP fuel pumps.

Estimated cost: $1,800-3,200

Typical onset: 80,000-150,000 mi

Symptoms: deep knocking from bottom end, low oil pressure warnings, metal debris in oil filter, catastrophic engine seizure if ignored

Fix: The W12's complex oiling system can starve main bearings during hard cornering or if oil changes are extended beyond 5k miles. Once bearings start spinning, the crank journals score and the block may be unrepairable. Full rebuild requires crankshaft removal, line boring, new bearings, and complete teardown (100+ hours). Often totals the car.

Estimated cost: $30,000-50,000