2006 BENTLEY ARNAGE

Typical onset: 60,000-90,000 mi

Symptoms: transmission overheating warnings on dash, fluid dripping from front of transmission, burnt transmission fluid smell, erratic shifting or limp mode

Fix: The ZF 6-speed's external oil cooler corrodes internally and leaks, contaminating fluid. Requires cooler replacement, lines flushed, fluid change, and often a filter service. 4-6 hours labor plus cooler and 8-10 quarts of expensive ZF fluid.

Estimated cost: $1,800-2,800

Typical onset: 70,000-110,000 mi

Symptoms: heavy clunk when shifting from Park to Drive, vibration at idle in gear, driveline shudder during acceleration, visible sagging of transmission when inspected on lift

Fix: The hydraulic transmission mount fails, allowing excessive movement. Replacement requires supporting the transmission and dropping the crossmember. OEM mount required—aftermarket don't last. 3-4 hours labor.

Estimated cost: $900-1,500

Typical onset: 100,000-150,000 mi

Symptoms: excessive oil consumption—more than 1 quart per 1,000 miles, blue smoke on startup or acceleration, knocking noise from lower engine, metal shavings in oil during changes, loss of compression

Fix: The 6.75L can develop piston ring wear, scored cylinder walls, or bearing issues if oil changes were neglected or turbos failed and sent debris through. Engine-out rebuild required: pistons, rings, bearings, machine work, turbo inspection. 60-80 hours labor at specialized shop.

Estimated cost: $18,000-30,000

Typical onset: 80,000-130,000 mi

Symptoms: coolant loss with no visible leaks, white smoke from exhaust, milky oil on dipstick or cap, overheating under load, bubbling in coolant reservoir

Fix: Aluminum heads on iron block expand differently, especially if engine has seen overheating. Both heads need removal, resurfacing, new gaskets, timing components inspected, coolant system flushed. 25-35 hours labor.

Estimated cost: $8,000-12,000

Symptoms: rough idle or hesitation, reduced power especially under boost, hard starting after sitting, check engine light for fuel trim or lean codes

Fix: The in-tank fuel filters clog from degraded fuel or tank sediment, and external filters also need regular service. If neglected, fuel pumps fail from overwork. Filter service every 30,000 miles recommended. In-tank filter requires tank drop—8-10 hours labor. External filter is 1 hour.

Estimated cost: $400-1,200

Typical onset: 90,000-140,000 mi

Symptoms: harsh or delayed shifts, transmission stuck in one gear, check engine light with transmission codes, flare between gears or slipping

Fix: The ZF solenoid valve body assembly fails from wear or contamination. Requires transmission pan removal, internal inspection, valve body replacement or rebuild, fluid and filter change. If caught early, doesn't require transmission removal. 6-8 hours labor.

Estimated cost: $2,200-3,500