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Re: GM 3100 oil? In coolant. Dexcool sludge
Posted to Technical Theory Forum on 8/7/2018 8 Replies

Dex cool has issues. Use any other coolant than that and you will be fine. The 3100 and the 3400 engines are good engines except for the repeated intake and head gasket failures that have plagued them from day one. If you just do the intake gaskets( which is w... Login to read more.

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