Decoding Oil Contamination in Water Coolants A Step-by-Step Guide

If you have oil in the coolant jug then you have a blown head gasket. Depending on if it's overheating your car is going to die. This happens because the o ring seals on the water pump have gone bad and turned hard as a rock and because of the seals can no longer separate ... There are a number of things that can cause oil in your coolant. In this video, I will show you how to check the engine oil cooler on a VW ... 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. Since oil pressure is higher then cooler pressure, the slightest leak in the oil cooler will enter the coolant. Since oil floats on top of water ... If your car's oil and coolant are mixing together, it's usually a case of having a blown head gasket. Run the engine from cold to hot with the coolant cap off. Watch for bubbles coming up in the tank. If any bubbles you have a blown head gasket. Why is there oil in my coolant? ... The presence of oil in a vehicle's engine coolant can be an indication that oil from the oil circulatory ... My FD RX7 has dual air oil coolers, but I sometimes suffer from oil temps spiking way above the coolant temp. It seems that one of the aluminum heads developed a pinhole leak in one of the STEEL freeze plugs, which then leaked water into the crankcase ...