2005 MERCEDES-BENZ SL600 R230

Typical onset: 60,000-100,000 mi

Symptoms: Metallic knocking or ticking from engine bay, Low oil pressure warning, Metal shavings in oil during changes, Sudden catastrophic failure with loss of power

Fix: The M275 is notorious for crankshaft and main bearing failures due to inadequate oiling under high load. Requires complete engine-out teardown, crankshaft replacement or machining, all bearings, piston inspection, and often piston ring replacement. Budget 40-60 hours labor plus $8,000-12,000 in parts. Many shops won't touch it; you're looking at specialist labor rates.

Estimated cost: $18,000-28,000

Typical onset: 80,000-120,000 mi

Symptoms: White smoke from exhaust on cold start, Coolant loss with no visible leaks, Overheating under load, Oil milkshake appearance on dipstick or coolant cap

Fix: V12 configuration makes this a nightmare. Engine doesn't need to come out but both valve covers, cam covers, and all ancillaries must be removed. Budget 25-35 hours labor. Often reveals additional issues like warped heads requiring machining. Parts include gaskets, ARP studs recommended, coolant, oil.

Estimated cost: $6,500-10,000

Typical onset: 70,000-110,000 mi

Symptoms: Car drops to bump stops when parked, ABC warning light with 'vehicle too low' message, Hydraulic fluid leaks under car, Harsh ride or one corner sagging

Fix: The hydraulic struts, pulsation dampers, and valve blocks all fail. Each strut is $1,200-1,800, dampers $400-600 each, valve block $2,500. ABC pump itself can fail ($3,000). A full system refresh with all four struts, dampers, and lines runs 12-18 hours labor. Partial repairs often lead to chasing leaks.

Estimated cost: $4,000-12,000

Typical onset: 80,000-130,000 mi

Symptoms: Harsh or delayed shifts especially 2-3 and 5-6, Limp mode with transmission warning, Slipping between gears under acceleration, Won't engage reverse or stuck in gear

Fix: The 722.6 transmission valve body and 13-pin conductor plate fail due to wear and fluid contamination. Transmission must be dropped (8-12 hours). Remanufactured valve body $800-1,200, conductor plate $300-500, new fluid and filter. Sometimes requires full rebuild if clutches are cooked.

Estimated cost: $2,800-5,500

Typical onset: 60,000-100,000 mi

Symptoms: Loud whining noise from engine bay especially on startup, ABC and airmatic warnings simultaneously, Slow suspension response or won't raise, Overheating smell from under hood

Fix: The tandem pump supplies both ABC and power steering. Failure is often due to contaminated fluid or age. Pump replacement requires removal of front subframe components, 6-9 hours labor. Remanufactured unit $1,800-2,500, new fluid for system, flush procedure critical.

Estimated cost: $3,200-4,800

Typical onset: 50,000-90,000 mi

Symptoms: Rough idle and stumbling acceleration, Long crank time before starting, Limp mode under boost, Misfires across multiple cylinders

Fix: The M275 has in-tank filters that clog and a high-pressure pump prone to failure. Tank must be dropped for filter service (5-7 hours), high-pressure pump is chassis-mounted (4-6 hours). Filters $200-400, pump $1,200-1,800. Often both need attention simultaneously.

Estimated cost: $2,000-3,800