This is this "standard" Mobil 1. Compared to last change, I went an extra 600 miles for the same OLM reading... Nothing seemed to change. I still have about 1 change worth of M1 left. Maybe I'll try a different flavor after that one and see if we can improve anything? Delco filter, no makeup oil. Added a temperature probe to monitor oil temp and it never went above 190F in the sump. I know Blackstone's fuel dilution is suspect. I almost want to throw a sample on the GC mass spec at work next go around and see what's what. Or maybe switch vendors for the testing.... Anyway, what all do you think?