BenzWorld Junior Member
Date registered: Mar 2018
Vehicle: 2008 ML320 CDI
Location: United States, Dallas, TX
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Quoted: 3 Post(s)
1 year into ownership, 2008 ML320cdi
Picked up an extremely clean 2008 ML320cdi a bit over a year ago. One owner, perfect service history, etc etc. This car has definitely taught me a thing or two on how high maintenance the OM642 can be.
6 months ago the car goes into limp mode, and I figure out that it's the swirl motor. So I check it out for myself. Oil has fallen from the turbo inlet. Turns out the red/orange gasket is crushed, torn, and misshapen, dripping oil directly onto the connector. Looks like the quality Mercedes shop I had change the oil recently did a garbage job of things. So I order new gaskets, and do the resistor mod instead of repairing the swirl motor. I'll repair or replace it if I ever open up the engine, but I'd rather not tear apart the engine for such an unnecessary fix.
A little over month ago I start to notice a bit of vibration when in gear. It was subtle at first, so it might've began even sooner without me realizing. Got underneath it that weekend to check the mounts and see that they're fine. A bit of searching online quickly brings up injector seal leaks, so I pull off the foam injector covers, and lo and behold, the far back passenger injector is absolutely caked up to the middle of the electrical plug in carbon. Parts came in and I had time to work on it this weekend. Ten (yes, 10) hours later of cleaning and careful prying, and the engine runs perfectly again. Injector was fine, didn't break the return line, didn't hurt any part of the engine.
So, one year later, do I regret buying this car? No. Smooth ride and great MPG while always having enough space for my things and people. Would I regret buying this engine if I couldn't do basic mechanical work by myself? Yes. There's no way I'd recommend this engine to anyone that can't do the wrenchwork themselves.