Bump, my M104 just started doing this after an oil change. I did change oil types but did not expect this to happen. I normally run generic oil, whatever is on sale. Nothing thinner than 10W40 but all the way on up to 20W50. This time I put in DELO 400 which is 15W40 (right in the middle). Car was "normal" for about 10 miles, then it sat about 2 hours. Upon restarting, there is 1 loud lifter; it's pretty pronounced. Drove about 10 miles home and it ticked all the way. Any ideas? I hate to drain the DELO and put generic 10W40 back in there, but I'd rather do that than damage something. That's a lot of $$$ down the drain.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280