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Re: Recommended Oil?
im going to be running the royal purple in my crate 350, and a lot of guys like the amsoil as well. These are probably the 2 most commonly available and you can always get them on line as well.
I won't speculate on the weight because I have no idea how you engine is built, I would have to go with what the builder said to use... but 20-50 in a rebuild motor sounds a little thick to me
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