Understanding Oil in Coolant Reservoir Causes and Preventive Measures

The oil cooler is leaking oil in the cooler system which is a common problem and the recommendation is to replace the oil cooler. You should be able to see the colour of your antifreeze in the reservoir tank when you remove the radiator or coolant reservoir lid. Oil remnants will be seen ... 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. 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 ... Any chance you topped off your coolant reservoir recently with a funnel you also use for oil? If you take your rig to a shop for service, did ... 3G TL Problems & Fixes - Oil in coolant reservoir and radiator - This is for my uncle's TL-S. It's a 2007 Automatic. Clean the coolant tank out with brake clean or engine degreaser, then follow up with dish detergent (that will remove all the oil residue). Let ... 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. 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. 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)