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Re: Engine oil 5w20 VS 5w30
Posted to Technical Discussion Forum on 4/11/2012 3 Replies

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GM wants you to use Dexron VI in place of Dexron III. Dexron VI is MUCH better! But, it's also significantly thinner which concerns me with older seals that may be hardening and may not seal well eno... Login to read more.

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