I stopped by my indepedant MB shop and tried to set a valve adjustment for tomorrow, but he was all booked up until after New Years. It doesn't seem to affect the performance of the engine. I have never had this "problem" with my SD.

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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