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

Very correct....I am so used to seeing this exact circumstance that it is the norm...but I also worked for gm dealers for years...they used to hand out the "gm approved cooling system sealer" on many jobs per gm warranty recommend. The scale/muck/residue is ra... Login to read more.