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20w-50 doesn't have the needed additives but sense the motors on it's last leg you might try some additives?
Yeah, I'll probably mix up a cocktail of stuff. I am thinking now a little Auto-Rx for the cleaning to start. I'll check out BITOG to see what help I can get over there too.
FWIW, I've commuted a week now and still no more unpleasant drops to zero pressure. Knock on wood.