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Re: GM 3100 oil? In coolant. Dexcool sludge
Posted to Technical Theory Forum on 8/8/2018 2 Replies

The brown goo you may be seeing may actually be bars leak as gm put this in the engine from factory during the 90s and early 2000s. On Cadillacs it even said to add it every time the cooling system was opened. If it were engine oil the hoses would be soft and ... Login to read more.

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