Car Model Guide/ Mercedes-Benz/ M-Class/ W164/ ML 350 M272/ Issues

ML 350 M272, known issues

W164 · 2005–2011 · R4 High risk

Recorded issues4
Walk-away1
Over €1,0002
Checkable at viewing1/4
Likely spend€3,000

Likely spend is the mid cost of every issue rated common or universal, added together, what an unmaintained example owes over the next few years, not a prediction for any one car. Worst case if everything here failed at once is €10,600, which isn't a realistic scenario but is a useful ceiling.

All issues, by system

Engine

M272 balance shaft gear wear (early petrol V6)W164 body€3,000–€6,000
A camshaft position fault code, a rough or lumpy idle, and a check engine light that returns after clearing. Balance shaft gears on M272 engines built inside the early range wore prematurely against the crankshaft gear. Later engines used a revised gear, so the engine number decides the risk rather than the mileage or the service book.
Check: Take the engine number and check it against the affected range before you look at anything else, because no amount of service history answers this. A stored camshaft correlation code is the other warning.
Later parts: Revised balance shaft gear on later production engines
EngineoccasionalPartly detectablewalk away without proofevidence: manufacturer80–200k km

Suspension

Airmatic strut and compressor failureW164 body€600–€3,000
The car sitting low after standing, a message on the dashboard, or a compressor that runs far longer than it should. The struts perish and leak, and the compressor then runs continuously until it burns out. Cars used for short trips and left standing suffer first, because the bags crack where they fold.
Check: View the car cold and before it's been started, then cycle every ride height and watch all four corners respond. A compressor that runs on after levelling is the early warning.
SuspensioncommonDetectable at viewingevidence: documented90–180k km

Turbo & intake

Carbon buildup on intake valvesdirect injection€400–€700
Rough cold idle, slow throttle response, misfires, gradual loss of low-end response. Direct injection puts no fuel over the intake valves, so crankcase vapour deposits bake on undisturbed.
Check: Not visible without a borescope. Treat it as a service item that's due unless there's a receipt. It's not a fault, it's an unbudgeted maintenance cost.
Turbo & intakeuniversalNot detectable at viewingevidence: documented80–120k km

Transmission

7G-Tronic conductor plate and 13-pin connector leak (722.9)Mercedes 7G-Tronic seven-speed automatic (722.9)€400–€900
Harsh, delayed or jerky shifts, holding a gear then banging the next in, and limp mode, often with speed-sensor or gear-ratio fault codes. The speed sensors in the conductor plate (mechatronic) fail, and/or the external 13-pin connector leaks fluid that wicks up the wiring into the control unit. Early units are the most affected.
Check: Test-drive through every gear cold and warm. Scan the transmission, and pull the external 13-pin plug to check for fluid on the pins.
TransmissioncommonPartly detectableevidence: documented120–220k km

How to read this

Every issue is authored once against the part that actually carries it: the engine, the gearbox, the chassis or a shared component, and inherited by every variant that has that part. The badge next to each issue says where it comes from, so you can tell an M272 problem from an E9x problem.

Evidence tiers. Manufacturer means a recall, technical bulletin or revised part number. Documented means workshop data or multiple independent sources. Reported means owner consensus with no hard confirmation, and never sets a risk level on its own.

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