The 2010 S600 houses the M275 5.5L twin-turbo V12, a complex engine notorious for catastrophic bottom-end failures due to inadequate main bearing oiling at idle. When that engine lets go, you're looking at rebuild-or-replace economics that often total the car.
Symptoms: Metallic knocking or rumbling at idle, especially when hot, Low oil pressure warning (often your only advance notice), Metal shavings in oil during changes, Sudden catastrophic failure with no warning in worst cases
Fix: Engine-out full teardown. Replace all main bearings, rod bearings, inspect crank for scoring (often needs machining or replacement). If crank is damaged, you're into full rebuild territory with pistons, rings, gaskets. 40-60 hours labor minimum for bearing replacement alone; 80-120 hours for full short-block swap or rebuild.
Estimated cost: $15,000-35,000
Turbocharger Failure
Occasional · high severity
Typical onset: 80,000-140,000 mi
Symptoms: Loss of boost pressure, sluggish acceleration, Blue smoke from exhaust on startup or acceleration, Whining or grinding noise from engine bay, Check engine light with underboost codes
Fix: V12 layout means tight access. Each turbo is 8-12 hours labor due to subframe work and exhaust manifold removal. If one turbo fails from oil contamination (common with bearing debris), the other often follows within 10k miles. Smart move is replacing both plus all oil feed/return lines.
Estimated cost: $8,000-16,000
Transmission Oil Cooler Line Leaks
Common · medium severity
Typical onset: 70,000-110,000 mi
Symptoms: Transmission fluid puddles under car (red fluid), Burnt transmission fluid smell, Harsh shifting or slipping when fluid is low, Transmission overheat warnings on dash
Fix: The external cooler lines corrode where they connect to the radiator and transmission. Line replacement is straightforward (3-5 hours), but often the cooler itself is leaking internally into the radiator, contaminating coolant. That requires radiator replacement and full fluid flush of both systems. Add 2-3 hours if doing radiator.
Estimated cost: $1,200-2,800
ABC (Active Body Control) Hydraulic System Leaks
Common · medium severity
Typical onset: 80,000-130,000 mi
Symptoms: Car drops to bump stops overnight or after sitting, ABC warning light with 'car too low' message, Green hydraulic fluid puddles (distinct smell), Harsh ride quality, inability to raise suspension
Fix: Leaks typically from front struts, pressure hoses, or the tandem pump. Front struts are 6-8 hours each. Pump replacement is 8-10 hours. Hydraulic hoses can nickel-and-dime you — there are dozens, and once one fails, others follow. System holds 7+ liters of fluid at $40/liter. Budget for multiple repairs over ownership.
Estimated cost: $2,500-7,000
Transmission Valve Body / Conductor Plate Failure
Occasional · high severity
Typical onset: 90,000-150,000 mi
Symptoms: Harsh or delayed shifts, especially 2-3 and 3-4, Transmission slipping or refusing to engage gears, Limp mode (stuck in one gear), Multiple transmission fault codes stored
Fix: The 722.9 7-speed transmission's valve body wears internally, and the conductor plate (electrical control module inside the pan) corrodes. Valve body replacement requires transmission removal on the V12 due to space constraints — 12-16 hours labor. Conductor plate alone is 6-8 hours if that's the only issue, but it rarely is by this mileage.
Estimated cost: $4,500-8,500
Engine Mounts (All Four)
Common · low severity
Typical onset: 60,000-100,000 mi
Symptoms: Vibration at idle, especially in Drive with brake on, Clunk when shifting from Park to Drive or Reverse, Excessive engine movement visible when revving
Fix: The V12's weight destroys mounts faster than V8 models. All four typically need replacement together. Front two are 2-3 hours each; rear two are 1.5-2 hours each due to better access. Total 8-10 hours for all four. Not difficult, just time-consuming because of the engine size.
Estimated cost: $2,000-3,200
Airmatic Air Suspension Compressor / Strut Failure
Occasional · medium severity
Typical onset: 90,000-140,000 mi
Symptoms: Suspension warning light, 'Airmatic Visit Workshop', One corner sags overnight (strut leak), Compressor runs constantly or won't run at all, Rough ride, bottoming out over bumps
Fix: Note: W221 S600 has ABC, not Airmatic on base models — but some markets got Airmatic. If equipped, compressor is 3-4 hours, each strut is 2-3 hours. ABC struts (see problem #4) are hydraulic and more expensive. Verify your system before ordering parts.
Estimated cost: $1,800-4,500
Owner tips
Change oil every 5,000 miles MAX with Mercedes-spec 0W-40 — the M275 bearing issue is oil-starvation related, and frequent changes buy time.
Budget $3,000-5,000/year for repairs after 80k miles; this is a $150k car with $150k repair costs.
Check oil level weekly — V12 can burn a quart every 1,000 miles and low oil accelerates bearing wear.
Get a pre-purchase inspection with oil analysis and leakdown test — a failed bearing job will appear as metal in the oil.
Keep $20k in reserve for when (not if) the engine fails — or walk away and buy a depreciated S550 instead.
Only buy if you have a $20k engine-failure fund and accept that annual maintenance rivals a mortgage payment — this is a $15k car with $40k repair potential lurking.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
Fitment notes: High-performance AGM battery required for V12 BiTurbo; located in trunk; dual battery system with auxiliary battery
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Every control module on the 2008-2013 Mercedes-Benz S600 — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
Active Body Control (ABC)2.0 hr R&Rdealer / factory tool +0.8 hr▸ programming details
📍 Front passenger footwell, behind the carpet/kick panel
🔧 Xentry/DAS with SCN
⚠️ Hydraulic active suspension; pump and accumulator failures common; system bleed required after service · Location verified on same-chassis S65 (W221) by owner 2026-07-19 and propagated; engine-bay components are the ABC hydraulics, not the control unit.
Electronic Stability Program / Anti-lock Brake System (ESP/ABS)1.8 hr R&Rdealer / factory tool +0.8 hr▸ programming details
📍 Engine compartment, left front near fender
🔧 Xentry/DAS with SCN
⚠️ Sensotronic Brake Control (SBC) system through 2009 MY; notorious for pump failure; 2010+ conventional ESP
⚠️ Multi-contour massage seats; memory positions stored in module
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2010 Mercedes-Benz S600 5.5L V12 BiTurbo M275 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.