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Mercedes M157
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Mercedes M157
Verdict
RISKY · 47/100
Est. cost /3yr
€9,000-21,000 over 3 years depending on maintenance history and whether deferred repairs are inherited at purchase
Oil interval
10,000 km
Recalls
0
Worst issue
Timing Chain Stretch and Tensioner Failure
CRITICAL
Mercedes M157
W212 · W212
Timing Chain Stretch and Tensioner Failure
€2,500-6,000
CRITICAL
Engine Oil Leaks (Front and Rear Seals)
€800-2,500
HIGH
Engine Scoring from Oil Starvation
€5,000-15,000
HIGH
Camshaft Position Sensor Failure
€200-600
MODERATE
Spark Plug Wear and Indexing Requirements
€300-700
LOW
Mercedes M157
W212 · W212
•Cold-start the engine and listen carefully for timing chain rattle in the first 5-10 seconds
•Request a full documented service history proving oil changes at or below 10,000 km intervals with approved spec oil
•Inspect the front and underside of the engine thoroughly for any signs of oil leaks or fresh sealant
•Perform an OBD-II scan for fault codes, specifically targeting camshaft sensor and timing-related codes
•Verify the timing chain and tensioners have been replaced or confirm their condition via specialist inspection
•Have an independent AMG-specialist mechanic perform a pre-purchase inspection before committing to purchase
•Ask whether the car has the AMG Performance Package or is a facelift S model, since power figures alone don't indicate reliability, only confirm which parts and ECU map are fitted
Mercedes M157
W212 · W212
Timing Chain and Tensioners
Inspect and replace if any rattle on cold start or extended crank time is present
70,000-100,000 km
Front Engine Seals and Gaskets
Inspect for oil leaks at pre-purchase and annually; replace before leaks worsen
80,000-150,000 km
Camshaft Position Sensors
Scan for fault codes before purchase; replace if codes present
60,000-120,000 km
Mercedes M157
W212 · W212
No recalls on record
Mercedes M157
W212 · W212
✓Immense performance potential with 518 to 577 hp depending on tune
✓Well-supported tuning ecosystem with many reputable AMG specialists
✓When properly maintained on short oil intervals, the engine can last well beyond 150,000 km
✓Twin-turbo layout and forged internals give real headroom for tuning without immediate reliability penalty
Mercedes M157
W212 · W212
Real consumption
14.7 L/100km
Official consumption
Not available
Oil interval
10,000 km
Oil spec
Mercedes-Benz 229.5 or 229.51, 0W-40 or 5W-40 fully synthetic
Est. cost /3yr
€9,000-21,000 over 3 years depending on maintenance history and whether deferred repairs are inherited at purchase
Mercedes M157
W212 · W212
518 hp · 700 Nm
2011-2013
550 hp · 720 Nm
2011-2013
557 hp · 720 Nm
2013-2016
577 hp · 800 Nm
2013-2016
The hp figure alone does not indicate reliability risk on the M157. All variants share the same block, timing chain design, and known failure points, the differences are ECU tuning and, on the S model, some cooling and driveline hardware. Buying decisions should be based entirely on documented oil change history and evidence of timing chain condition, not on whether the car is a base, Performance Package, or S variant. A high-mileage 518 hp car with full service records is a safer buy than a low-mileage 577 hp S with gaps in its history.