Well I drained all the DELO after just a few miles and filled with standard 10W40. You guessed it, no change. I then pulled the oil filter and found it was the culprit. It had come unseated from the housing and went in crooked. There was a dent in it from where it was crammed up against the check valve. I reseated it properly and now the engine is silent again.

I am really upset that I dumped $40 of perfectly good DELO for nothing, but a lesson was learned. NEVER go with cheap STP oil filters from AutoZoo. I normally order my filters from this site, or get them from the dealer, and keep a spare in the trunk, but I ran out and needed one NOW. Next time I'll just wait or drive to the dealer.

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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