Coolant in Engine Oil
- Wrench set
- Socket set
- Protective eyewear and clothing
Begin with the car on level ground with the engine "OFF" and the parking brake on. Step 1 - To check for coolant in the oil first remove the oil fill cap and inspect the underside while looking into the engine with a flashlight. If a milky white or yellow colored oil is detected the engine is leaking coolant internally. (Note: If an engine has not been run very much there will be a slight amount of milky oil due to condensation which is not present in engines that are run on a regular basis.) Step 2 - Remove the engine oil level dipstick to inspect oil consistency and color. If the oil is milky and yellow coolant has made its way into the engine.
Helpful Information Coolant runs throughout the engine block, cylinder heads, intake manifold, (some applications) engine oil cooler (if equipped) hoses, heater core and radiator. Visit - Cooling system. The engine cannot run with coolant in the oil system, catastrophic failure will occur. Do not run an engine once is coolant is discovered in the engine oil. These repairs can be tricky because they overlap and it can be difficult to tell which one is causing the problem before the repair has begun.