Oil in Coolant Reservoir A Step-by-Step Guide to Understanding and Fixing

They put a special cap on your cooling system and pressurize it, then monitor it for a period of time. if the pressure drops you have a leak somewhere. Subaru oil in coolant, no coolant in oil, but how and why. Happy ... WHY COOLANT IS BOILING IN THE COOLANT TANK RESERVOIR ON A CAR. Auto ... A leak between the oil containing part of the block and the cooling part is the only way that you can get motor oil in 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 ... 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. This is quite a common problem with the 272/273 motors. Replacing the seal alone will not fix the entire problem you have at this point. You ... The oil dipstick looks nice and clear/dark pure oil, no coolant. Could it be related to the radiator, or any other part of the car that would have been damaged ... The ONLY place I'm finding oil is IN the antifreeze coolant reservoir. Just to clarify: 1. There is NO power loss at all. The car feels and performs great. If you have oil in your reservoir you have a blown head gasket my friend. You can see it better in the reservoir then you can in the radiator. 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.