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2017 MERCEDES-BENZ S65 AMG

6.0L V12 BiTurbo M279•RWD•AUTOMATIC•gas•turbo
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5-Year Cost of Ownership
$40,752 maintenance + known platform issues
~$8,150/yr · 680¢/mile equivalent · $9,229 maintenance + $28,923 expected platform issues
Common Problems & Known Issues

The 2017 S65 AMG houses Mercedes' final naturally-aspirated twin-turbo V12—the M279—a magnificent but maintenance-intensive powerplant prone to catastrophic internal failures when oil service intervals are ignored. This flagship sedan combines cutting-edge electronics with old-school V12 complexity, resulting in expensive repairs that can exceed the car's resale value.

M279 V12 Catastrophic Engine Failure (Bearing & Piston Damage)

Occasional · high severity
Typical onset: 40,000-80,000 mi
Symptoms: Metallic knocking or rattling from engine bay, especially cold start, Low oil pressure warning despite adequate oil level, Metal shavings or glitter visible in oil during changes, Sudden loss of power or misfire codes on multiple cylinders
Fix: This V12 suffers main and rod bearing failures tied to oil coking in the turbo oil feeds and marginal oiling design. Repair requires complete engine-out teardown: bearings, pistons, rings, honing, and sometimes crankshaft machining. Budget 60-80 labor hours for a full internal rebuild; many owners opt for factory reman short blocks at $35K-$45K plus 40+ hours labor. Preventive: 5,000-mile synthetic oil changes with MB 229.5 spec are non-negotiable.
Estimated cost: $25,000-65,000

7G-Tronic Transmission Oil Cooler and Valve Body Failures

Common · high severity
Typical onset: 50,000-90,000 mi
Symptoms: Harsh or delayed shifts, especially 2-3 and 3-4 upshifts, Transmission enters limp mode, dash displays 'Visit Workshop', Metallic debris in transmission pan during fluid service, Erratic gear hunting or refusal to downshift under throttle
Fix: The 7-speed auto's integral oil cooler develops internal leaks, contaminating fluid and starving valve body solenoids. Fix involves transmission removal (12-14 hours), replacing cooler, conductor plate, solenoids, and full fluid flush. This trans doesn't respond well to band-aid fixes; half-measures lead to repeat failures within 10K miles. OE parts only—aftermarket valve bodies cause adaptive learning chaos.
Estimated cost: $4,500-7,500

Turbocharger Wastegate Actuator and Oil Feed Line Coking

Common · medium severity
Typical onset: 60,000-100,000 mi
Symptoms: Sluggish acceleration or boost underperformance above 3,500 RPM, P0299 / P0234 boost control codes, Turbo whistle or chattering during spool-up, Blue smoke on startup after sitting overnight
Fix: Twin turbos develop sticking wastegate arms and coked oil feed lines, starving bearings. Each turbo requires removal (8-10 hours combined for both sides on this V12), actuator replacement, feed line cleaning or replacement, and new oil drain tubes. If bearing damage has occurred, add $3K-$5K per turbo for CHRA replacement. Catch-can installation on crankcase vent helps slow coking but isn't a cure.
Estimated cost: $3,500-9,000

ABC (Active Body Control) Hydraulic System Leaks

Common · medium severity
Typical onset: 70,000-110,000 mi
Symptoms: Car sagging at one corner overnight or after sitting, ABC warning light with 'Visit Workshop' message, Green hydraulic fluid puddles under car (front or rear struts), Hissing sound from suspension when driving over bumps
Fix: The S65's ABC struts and hydraulic lines age poorly; seals harden and pressure accumulators fail. Each strut runs $1,800-$2,500 OE, plus 3-4 hours labor per corner. Front valve blocks also leak ($2,200 part, 6 hours). System must be bled with Mercedes STAR diagnostic tool—no shortcuts. Total system refresh (all four corners plus pump) can hit $15K. Many owners convert to coil springs ($4K-$6K kit plus 12 hours), losing adaptive damping but gaining reliability.
Estimated cost: $2,800-6,500

Magic Body Control Camera and Sensor Failures

Occasional · low severity
Typical onset: 50,000-90,000 mi
Symptoms: Magic Body Control unavailable message on dash, Windshield-mounted stereo camera showing condensation or cracks, Suspension no longer pre-adjusts for road imperfections, Random ABC faults with no visible leaks
Fix: The forward-facing stereo camera (behind rearview mirror) fails from heat cycling or moisture intrusion, disabling road-scanning suspension. Replacement is 2-3 hours including windshield removal and STAR recalibration. Part alone is $2,400-$3,200. Also common: front suspension ride-height sensors corrode (Florida/salt-belt cars), causing constant ABC adaptation errors—$450 per sensor, 1.5 hours each corner.
Estimated cost: $2,800-4,200

Alternator and Battery Management System Failures

Occasional · medium severity
Symptoms: Multiple electrical warnings on start: ABS, ESP, steering assist unavailable, Battery discharges overnight even with new battery, Alternator producing 12.8V or less at idle (should be 14.2-14.8V), Click-no-start despite jump attempts, or random stalling
Fix: The 220A alternator fails internally or its voltage regulator goes haywire, confusing the battery management module. This car uses lead-acid AND lithium auxiliary batteries—wrong replacement types brick the system. Alternator R&R is 4-5 hours (V12 packaging nightmare). Must register new battery with STAR or you'll chase phantom electrical gremlins for months. Budget $1,200-$1,800 for alternator, $800-$1,200 for AGM battery plus coding.
Estimated cost: $2,000-3,500
Owner tips
  • Oil changes every 5,000 miles with MB 229.5 spec synthetic are the only way to preserve the M279 V12—ignore this and budget for a $40K engine rebuild by 60K miles.
  • Inspect ABC hydraulic fluid monthly; green puddles mean immediate repair to avoid strut damage and $6K+ corner replacements.
  • Keep a $3,000-$5,000 annual repair reserve—this car's maintenance costs rival its fuel bills, and independent shops with STAR diagnostic access are essential.
  • Avoid extended warranties that exclude 'wear items'—they'll classify turbos, ABC components, and transmission valve bodies as wear, leaving you holding five-figure bills.
Buy only if you have deep pockets and a masochistic love for hand-built V12s—spectacular to drive, financially devastating to own past 60K miles.
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.
526 jobs across 17 categories
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.
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