Unveiling the Mystery Oil in Coolant Reservoir and Its Impact

Most likely thing is the transmission cooler leaking internally in the radiator as you have already mentioned. The second most likely thing from ... The tech said he thinks it's the DSG transmission cooler since the oil in the coolant is very dark, vs the engine oil which is as clean as a whistle. 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 ... In operation, oil is at higher pressure than the coolant, so if the leak is small you can get a slow migration of oil from crankcase to ... Hello I have 2012 ram bighorn 5.7 hemi. Recently I have oil in coolant and in reservoir and radiator. I don't know what happened oil was ... Replace oil cooler. Fill cooling system w/ fresh water. Add a small(!) amount of detergent to coolant tank, run vehicle for a short bit. Drain. The only good news is that oil in the coolant is better than coolant in the oil... Expensive fix, but probably worth doing. Any car can have a head gasket fail. The oil filter housing has a one peice gasket for coolant and oil, if this gasket is bad enough it can cause the mixing of oil and coolant. The only way to get oil in the antifreeze is with a gasket leak between the cooling and oil systems in the engine or if the transmission cooler in the radiator ... The oil cooler is leaking oil in the cooler system which is a common problem and the recommendation is to replace the oil cooler.