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I noticed that I seem to have an oil leak from the front of the engine (valve cover gaskets & oil pan are dry). There is a plastic component on the front that looks like the intake from the intercooler that is weeping oil on the front of the engine. I've been looking for a parts diagram, but can't locate one for what this part is, or if it has any gaskets in it.
Diesel correct? Read threads about oil cooler leaks. There are a number of relatively common oil leaks on this engine. Browse the 166 sections and search for OM642 oil leaks.
The component you are looking at is part #5. I've noticed a leak from the muffler (turbo muffler?) as well on my Dad's ML. He had taken the vehicle in for the Field Measure and they diagnosed a few leak points - 1 being the muffler and the intercooler hoses (#3 ) on both sides (they have rubber seal o-rings that failed). They ended up replacing the 2 hoses as part of field measure.
When he got the vehicle back, I took out the muffler, there are a few Torx bolts holding the 2 halves together that were all surprisingly loose. Tightened them and it seems to have resolved the leak for now as it is dry, not sure if there is a serviceable gasket in the part but haven't ventured to that point yet.
Since this is part of induction system, that means oil may either be coming from turbo intake compressor side or PCV (air-oil separator) into air intake.
I had to add 1L of oil 8K miles after my last oil change due to low oil warning message. This is the first time I ever have to do this between oil changes.
Upon further inspection, I noticed the following:
- I had same greasiness like the picture from OP
- air intake to turbo area is very greasy due to oil leak
- CCV tubing to intake very wet
I ordered CCV from FCP Euro and just finished installing it. Below is a pick comparing old and new CCV showing the enlarged center hole of the old vs new, which allowed oil to get sucked in to the intake.
I then sprayed this to the CCV hose port in the air intake while the engine is running until the can was empty.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
