Re: FE 390 oil related questions
A noted Y Block engine builder uses Valvoline 10-30 and 10-40 conventional oils in all his engine builds (he so notes in his descriptions) with the proviso that it be changed once a year.. That's good enough for me. No additive but I think it does use an additive for break in.
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48 Ford Conv
56 Tbird
54 Ford Victoria
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