Should I Use a Lighter Winter Oil Weight?

AMSOIL recommends using a lighter winter oil weight when the temperatures drop. This improves cold starts and maximizes wear protection at startup. Synthetic oils provide better cold starts because petroleum-based oils contain wax. Wax thickens when it gets cold. Amsoil Signature series 5-30 will actually pour at -50 degrees F. Petroleum-based oils in the same weight will barely move, more info on this article.

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