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most viscosity changes within the same oil line (usually) have the same film strength rating. I personally run Amsoil, and they are very happy to display their raw data as well as additives on all oils. everything from 10w30 to 0w50 have +-200psi film strength across their HM lineup. please dont quote me in saying all oils are like this, but it would be fair to assume if a company makes a high quality oil that is listed at the top of the page, they wouldn't cheap out and put a different weight next to the dollar store crap.
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