Mercedes-Benz V6 engine with its engine cover

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Mercedes M272 V6 common problems by mileage

Common problems · Mercedes-Benz · 4 known issues

The M272 is smooth and reasonably tough, with one famous problem on earlier engines: the balance shaft sprocket. Know whether your engine is affected and the rest is normal Mercedes upkeep.

Covers: Roughly 2005–2011 C230, C280, C350, E350, ML350, SLK280/350, CLK350, R350, GLK350 and others with the 2.5, 3.0 or 3.5 V6.

When these usually show up

Routine wearFix it when it startsCan wreck the engine or gearbox

Thermostat

Balance shaft sprocket wear (earlier engines)

Intake manifold runner flaps

Oil leaks (oil cooler seals, valve covers)

0k50k100k150k200k

Miles where owners and shops commonly report each problem. Plenty of cars go longer, some fail sooner. This is a heads-up list, not a schedule.

The list, in mileage order

ThermostatRoutine wear

Usually about 60k–120k miles

Signs: Temp gauge slow to warm up, heater not very hot, coolant codes.

Routine replacement part on this engine.

No price reports for this one yet. Paid for it? Add yours.

Balance shaft sprocket wear (earlier engines)Can wreck the engine or gearbox

Usually about 60k–120k miles

Signs: Check engine light with cam/crank correlation codes (P0016, P0017 and similar), sometimes a rattle.

Engines built up to roughly mid-2006 used a sprocket that wears. The fix is labor-heavy. A shop can check your engine serial number to see if you are in the affected range.

What owners paid: non-dealer median $4,400 (2 reports) · dealer median $3,500 (1). All 3 reports → · Repair guide →

Intake manifold runner flapsFix it when it starts

Usually about 70k–130k miles

Signs: Check engine light for intake runner codes, slight loss of low-end power.

The plastic levers on the runner flaps break. Often the fix is a new intake manifold, though repair kits exist.

What owners paid: dealer median $2,400 (2). Small sample, so treat it as rough. All 2 reports →

Oil leaks (oil cooler seals, valve covers)Routine wear

Usually about 80k–150k miles

Signs: Oil on the top or front of the engine, burning smell.

Gaskets and seals at this age. The oil cooler seal job is mostly labor.

No price reports for this one yet. Paid for it? Add yours.

Shop-floor advice

If the check engine light comes on with cam correlation codes, don't clear it and hope. Get it diagnosed.
Ask the shop to check the engine serial number before you buy an M272 car.

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This article is general information for car owners. It is not a substitute for a diagnosis by a qualified mechanic who can inspect your car. Prices mentioned are medians of owner reports, not quotes.