2017 BENTLEY FLYING SPUR

Typical onset: 60,000-90,000 mi

Symptoms: Misfires and rough idle that progressively worsen, Loss of power and poor throttle response, Engine knock or metallic rattle from bottom end, Eventual complete engine failure with spun bearings or cracked pistons

Fix: Direct injection W12 suffers intake valve carbon buildup causing lean conditions and detonation. Leads to piston ring land failure, cracked pistons, and spun rod/main bearings. Full engine rebuild required: remove engine, disassemble, replace all pistons, rings, bearings, machine crank if scored, resurface heads, replace timing chains/guides while apart. 80-120 labor hours depending on additional damage.

Estimated cost: $35,000-55,000

Typical onset: 50,000-80,000 mi

Symptoms: Transmission fluid in coolant or coolant in transmission (strawberry milkshake fluid), Transmission slipping or delayed engagement, Overheating transmission temperature warnings, Engine overheating in severe cases

Fix: The ZF 8-speed's internal cooler fails where it interfaces with coolant passages, allowing cross-contamination. Requires complete transmission flush, cooler replacement (integrated into transmission housing on some versions, requiring case disassembly), new fluid and filter, cooling system flush. If contamination severe, full transmission rebuild needed. 12-18 hours for cooler only, 35-50 hours if transmission damaged.

Estimated cost: $4,500-8,500 for cooler; $15,000-22,000 if transmission rebuild required

Typical onset: 70,000-110,000 mi

Symptoms: Harsh or delayed shifts, especially 2-3 and 3-4, Transmission fault codes and limp mode, Erratic shifting patterns or stuck in single gear, Transmission slipping under load

Fix: ZF 8HP solenoid valve body develops internal wear and electrical faults. Must drop transmission pan, remove valve body, replace entire solenoid pack (not sold individually). Includes mechatronic sleeve replacement, new transmission fluid and filter, adaptation programming. 8-12 labor hours.

Estimated cost: $3,200-5,500

Typical onset: 40,000-70,000 mi

Symptoms: Clunking on acceleration or deceleration, Excessive driveline vibration at idle in gear, Visible transmission sag or movement, Harsh engagement into drive or reverse

Fix: Hydraulic transmission mounts fail from age and heat. Requires lifting powertrain slightly, replacing mount(s). Front mount more common than rear. 3-5 hours per mount including alignment.

Estimated cost: $1,200-2,200

Typical onset: 50,000-80,000 mi

Symptoms: Long cranking before start, especially when hot, Loss of power under acceleration, Fuel pressure fault codes, Rough running and misfires under load

Fix: W12 uses high-pressure direct injection filter that clogs with debris from fuel system contamination or pump wear. Filter located in engine valley, requires intake manifold removal for access. Replace filter, inspect fuel system for contamination source. 6-9 labor hours due to access difficulty.

Estimated cost: $1,800-3,200

Typical onset: 80,000-120,000 mi

Symptoms: Rattling from engine on cold start that subsides when warm, Metallic ticking from front of engine, Timing-related fault codes, Check engine light with cam/crank correlation codes

Fix: W12 has complex timing chain system with plastic guides that wear. If caught early, replace chains, guides, tensioners without engine removal. If jumped timing or guide fragments in engine, requires full teardown. Front of engine work: 25-35 hours preventive, 80+ hours if internal damage occurred.

Estimated cost: $8,500-14,000 preventive; see engine rebuild cost if internal damage