The link to the Topklasse forum above also contains the factory documentation to look up the engine numbers of affected cars with this M272 balance shaft problem. The dealer was also unwilling to let me have a mechanic check to see if the job had been done. From what I read, repairing the M272 balance shaft means a partial disassembly of the engine and at least $7,000. Late 2007 models are also generally fine. Most likely I’ll be looking for an ’04 or ’08 model instead. This was enough to put me off buying a car I would have otherwise bought. ![]() The M272 is 90 degrees so it can be built alongside a V8. From what I understand as this engine is a 90 degree V6, there were additional components required to make it run smoothly and these and the timing gear can suffer from premature wear. I went to look at an 2006 E350 W211 Estate today and had learned on the Topklasse forum that the M272 engine manufactured from 2005-2007 suffers from a potential defect.
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