Oil in Coolant Uncover the Root Causes and Preventative Measures

Nope there is no place that oil and water intersect besides inside the engine. You're most likely going to find that's it's: #1 blown head gasket (semi common) If oil is leaking into your coolant, the coolant will be overflowing because oil is adding to the coolant. Therfore, your oil should be consumed. If there's oil in the coolant reservoir it could be a head gasket. If you open the radiator cap with the engine cold is there oil present under it? When a head gasket fails, oil can leak into the cooling passages and then end up in the coolant. This results in the brown sludge that can be seen in the top of ... Coolant can react to oil and make it sludge, which isn't good, and coolant in your lubrication system would be bad. So the next step is to ... The oil always ends up in the overflow. It floats on the coolant, so it's the first to get pushed out into the expansion tank when the motor warms up. This oil is from tranny as it uses the radiator as a form to cool down the tranny oil. The color of the mess was milkshake. 3G TL Problems & Fixes - Oil in coolant reservoir and radiator - This is for my uncle's TL-S. It's a 2007 Automatic. Share your videos with friends, family, and the world. Worst case is blown head gasket. There's a kit which attaches to the cooling system. It contains a dye that reacts with hydrocarbons.