2013 MERCEDES-BENZ S600

Typical onset: 40,000-80,000 mi

Symptoms: Metallic rattling on cold start that disappears when warm, Excessive oil consumption (1 quart per 500-1000 miles), White or blue smoke from exhaust on startup, Loss of compression in one or more cylinders, Complete engine seizure in worst cases

Fix: The M275 suffers from defective Nikasil cylinder wall coating that wears prematurely, leading to piston slap, scoring, and eventually complete failure. Requires full engine rebuild with re-sleeved cylinders or short block replacement. 60-80 hours labor for rebuild, 40-50 hours for short block swap. Many shops won't touch it—you're looking at specialist territory.

Estimated cost: $25,000-45,000

Typical onset: 60,000-100,000 mi

Symptoms: Deep knocking sound from lower engine that increases with RPM, Sudden drop in oil pressure, Metal shavings in oil during changes, Check engine light with low oil pressure codes, Engine can fail completely within minutes of first symptoms

Fix: The M275 has inadequate bearing clearances and oil delivery issues that cause premature bearing wear. Once knocking starts, it's already too late—metal debris contaminates the entire system. Requires full engine teardown, crankshaft inspection/machining, all new bearings, and often new pistons and rods. 70-90 hours labor. Preventive bearing replacement at 60k miles is cheaper than the alternative.

Estimated cost: $18,000-35,000

Typical onset: 80,000-120,000 mi

Symptoms: High-pitched whining or whistling under acceleration, Sudden loss of power and boost, Blue smoke from exhaust under load, Oil pooling under car near firewall area, P0299 underboost codes or P0234 overboost codes

Fix: Twin turbos fail from oil starvation (related to bearing debris from engine issues) or worn seals. Oil feed and return lines become brittle and leak. Each turbo requires 8-12 hours labor to replace due to V12 packaging. Oil lines add another 4-6 hours. Must address root cause of oil contamination or new turbos will fail quickly.

Estimated cost: $8,000-15,000

Typical onset: 70,000-110,000 mi

Symptoms: Transmission fluid leaking near radiator area, Harsh shifting or delayed engagement, Clunking when shifting from Park to Drive, Visible engine/trans movement during acceleration, Pink or red fluid mixing with coolant in overflow tank

Fix: The external oil cooler develops leaks at crimped connections, causing fluid loss and potential trans damage. Hydraulic transmission mount fails from the massive V12 torque. Cooler replacement is 3-4 hours, mount is 5-7 hours due to subframe work required. Replace both together since you're in there anyway.

Estimated cost: $2,800-4,500

Typical onset: 80,000-130,000 mi

Symptoms: Car sits noticeably lower on one corner or all corners, ABC warning light with 'Stop vehicle too low' message, Loud humming or whining from under hood, Harsh ride quality and no self-leveling, Hydraulic fluid leaks under vehicle

Fix: Active Body Control system uses high-pressure hydraulic pump and accumulators that wear out. Pump rebuild is 6-8 hours, accumulator replacement 2-3 hours each (there are multiple). Front struts commonly leak as well. ABC specialist strongly recommended—incorrect work can damage $3k+ struts.

Estimated cost: $4,000-8,000

Typical onset: 90,000-140,000 mi

Symptoms: Extended cranking before engine starts, Rough idle and misfires when cold, Loss of power at higher RPMs, P0087 fuel rail pressure too low codes, Strong fuel smell from engine bay

Fix: High-pressure fuel pump fails due to contamination or wear, and the 12 direct injectors can clog or leak. Pump replacement is 4-6 hours. Injectors are 2-3 hours each due to V12 access issues—replacing all 12 is 20-25 hours. Fuel filter (often neglected) should be changed every 20k miles but many owners skip it, accelerating pump death.

Estimated cost: $3,500-12,000