Originally Posted By: 2000NWXJ
Thanks for all the responses. Mechanic said it was not coolant that it would be more like a milkshake. The oil is thick and dark black in normal light.
Originally Posted By: Colt45ws
Yes, with a lot it would be milkshake. With low percentages it won't show color wise but the oil will still take a beating. On my grandparents old GM 3400 engine, the first time I tested it, the oil came out fine, but had 1.43% coolant and the oil was not in good shape.. It had 0.8% Insolubles (sludge) after only 2500 miles.
It takes a fair amount of coolant to make the milkshake appearance.
Go to NAPA and get the Wix oil test kit. That will verify for sure.
Colt45ws is correct. Your mechanic is not. It doesn't take much coolant at all to turn oil into a gooey, sludgy mess- and it WILL NOT turn light colored. I've seen it several times before, to the point where I can usually tell from the oil that comes out of the pan during an oil change. If you shine a pen light at it while poking your finger into the outgoing stream of oil, it'll appear chocolate colored and you'll barely be able to see through it, if at all. Normal oil is generally translucent and lacks the chocolate color.