I like and use either 5w20 WT or 5W30 wt non synthetic oil in all my drag and street and strip motors with really loose clearances (.003+ on the rods and .0038+ on the mains)compared to some of the other posters on here shruggy Works good, last a long time thumbs


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)