
Re: GM 3100 oil? In coolant. Dexcool sludge
G'day Dennis, the good and inexpensive way to determine if it is oil or coolant sludge is to put some between finger and thumb and see if it is soluble under water, rubs off in water. If you are left with an oil residue on finger and thumb it's oil, whereas co... Login to read more. ![]()
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