Oil Weight?

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I run 10w-30 Mobil 1 Full Synthetic.
Thanks much. Looks like just about anything goes! With 20w50 being most popular.
old engine - not rebuilt 20w50
standard rebuild 10w30 or 40
good rebuild - 10w30 synthetic

I have run all three of the above scenarios
castrol 20/50 recomended in my '75 owners manual.

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