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Re: Oils for older vehicles and new engine break in
Posted to Castrol Forum on 7/30/2017

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This is based on several common misconceptions:

SAE 20W and SAE 20 are two completely different ratings. SAE 20W-20 is a multigrade oil (and was fairly popular at one time). SAE 10W-40 is NOT an "S... Login to read more.

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