Oil in Coolant Reservoir A Clear Guide to Causes and Solutions

The oil drops are suspended and floating in the coolant. Check your oil level next and look for white goo on the inside of the oil filler cap. I was on a trip, over 300 miles from home, when my 2014 Passat TDI started spewing black engine oil out of the coolant overflow tube. Seems to be running and idling well, temp normal. Light brown oily mousse in the radiator and overflow reservoir. Engine oil is normal. GL 450 2007. It's still drivable. I just got an alert yesterday that coolant is low. Is this an expensive fix ? 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. Engine Oil in Coolant Reservoir - Can the Engine Oil Cooler Leak Into the Coolant? ; EUROW. 446 posts · Joined 2022 · #2 ; mschwab327. 169 posts ... 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 ... 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 coolant reservoir was leaking a brown liquid. I guess this is oil and i have heard that means its most likely a blown head gasket. The oil cooler seems to be leaking and it may be clogged since both cooler hoses going in were dry inside and there were no signs of fluid moving through.