Cod Liver Oil + Marvel mystery oil of course
My 11 Diesels get Rotella, and I run EXTENED change intervals
MY girl was getting M 1,
Till I found Royal Purple 20W-50 for $8.00 a qt. cleaned out their stock
I'll put at least 7,500 before change , unless the shifting changes, which I doubt, have 5,000 now and smooth...
Red line is the best , but not needed for street use.
I have friends that spray Nitrous Oxide in race motors 10,000 + rpm and they call Red Line INSURANCE.