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I know RP used to be a great product.
I have heard a lot lately that it has gone down hill, ironically right around the same time that Mobil 1 went full retard.
I can tell you that Amsoil Signature claims that it only needs to be changed like every 25 thousand miles, which is a very bold statement.
I would never ever recomend running an engine for 25k miles without an oil change, fyi
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