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Re: GM 3100 oil? In coolant. Dexcool sludge
Posted to Technical Theory Forum on 8/7/2018 3 Replies

I have seen many "brown" coolant bottles over the years due to excess block rust. Use a multi meter and drop the positive lead into the coolant and ground lead to the battery and you will find a slight voltage charge in the coolant. This will mess with sensors... Login to read more.

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