Sometimes it can be counter productive to clean all that gunk off the engine. That gunk is probably stopping or slowing down an oil leak. Unclot that and there she flows.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member