My basically stock 390 rebuild is almost complete and I was wondering what weight oil I should use in the engine? Basically all parts of the engine are rebuilt. Also, how long should I wait before I change the oil for the first time? Any advice would be appreciated! Thanks.
I guess the answer to this question is simular to asking what flavor ice cream do you like. Everyone has a different answer. I just had my 390 rebuilt. I run 5w-40 because that's what I have ran since forever. I changed the oil (and filter of course)at the 500 mile mark.
1970 F-250 Hi-boy 4x4, 3-inch body lift, 390FE bored .060 over, Edel RPM intake, GT profile cam, Holley Street Avenger Carb, NP-435 four speed, Heddman Hedders, Unilite dizzy mod, 36" A/T's, 16 gal Aux fuel tank added.
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