There are two main sources of leaks on the OM642.
The easy one is the big orange ring on the turbo air inlet, or the crank breather and PCV valve going into the side of the air horn on the turbo inlet. Either of these can cause blow by oil to leak and drip under the car. It is easy to tell if it is blow by or pure oil, the blow by will dry hard and sticky.
However if you are dripping actual engine oil, then it's time for... A journey into the the infamous Om642 oil cooler leak!
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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)
both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)
1998 E300DT sold to TimFreeh
1987 300TD sold to vstech
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