Beware of Oil in Your Coolant A Guide to Diagnosis and Repair

It's your oil cooler. I promise. Drain and change NOW before you build too much sludge throughout cooling system and heater core. It's going to ... Engine oil in coolant! ... Yikes. Not a common issue. My suspicion would be head gasket. Did you buy this car from a dealer? ... That's bad! The diagnosis was that the oil cooler was leaking oil into the coolant. The oil cooler is part of the oil filter housing. they did install a new ... I noticed oil in the coolant. No foam on the cap and no foam on the oil cap either. Checked everything and doesnt seem like a head gasket thats blown. 2nd Generation S-series (1995-2005) Tech - Oil in coolant reservoir - It seems to be that I have oil in my coolant reservoir and I know what ... Oil filter housing gasket is common failure point and can cause this - coolant runs through there. You should also change your oil when you do the gasket as ... The coolant in a 5.3L Vortec does not communicate in any way with the intake manifold so a blown intake manifold gasket can not get oil into the coolant. Typically it's an oil cooler failure. If the cooler wasn't properly torqued last time, it could have lead to the premature failure this go ... Only way to tell at this point is to perform a compression and leak-down test to see if it really is the head gasket or something else. Fresh ... Instead of liquid soap, I would use baking soda and water. I would mix the baking soda and water in a 5 gallon bucket and I would add enough ...