Detecting Oil in Water Coolant A Step-by-Step Guide

For coolant to be getting into the oil I'd say you've got a bad oil seal #8 on the oil pump/water pump shaft. My FD RX7 has dual air oil coolers, but I sometimes suffer from oil temps spiking way above the coolant temp. Under the oil fill cap there was that light brown stuff that forms when oil and water come together. Also drained the water from the coolant ... If your car's oil and coolant are mixing together, it's usually a case of having a blown head gasket. I'd say say flush the coolant with distilled water first the refill with 50/50 and you should be good to go. I second replacing both of the gaskets. Be sure to ... A blown head gasket normally fails from the cylinder. If it connects to the water jacket the water will be heated rapidly, causing the boiling. Hose / tap water is fine. Distilled is recommended only because it is convenient and reliable, more convenient than an analysis of tap water. If you have oil mixed with coolant in the reservoir, you will notice a thick, milky or gravy-like substance that is a tell-tale sign that you have this issue. I have a 09 Beetle, my mechanic called me with my issue and it was a failed oil cooler. I had oil in the coolant and the car overheated. A bit of oil in the coolant does aid the water seal on the pump but a lot is a problem. If you have antifreeze in the coolant it will breakdown ...