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It used to be that in that if you ran conventional you ran 15w-40 and if you ran synthetic then there was no 15w-40, so you ran 5w-40. Typically for me, it would be Rotella, T4 vs T6 (since you don't know how much of each there is in a synthetic blend if I felt like saving some money I would get...

Car- 80's Trans Am, sort of race car which gets used on the street a lot (most racing is drag racing with some autox/road course). A lot of >20 minute trips a couple times a week on the street, longest normal drive is 30-40min to the track. It does not see enough street miles to make any regular...