Quote:
Originally Posted by Formula413
I don't put anything from the catch can back into the engine, I just recycle it. It's not just oil, but a mixture of whatever crap shows up in the crankcase, unburned fuel, cylinder blow by, water vapor etc. It's mostly oil but I wouldn't try to lubricate an engine with it.
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A lot of cars that have an oil separator do drain it back into the oil pan. Any unburned fuel and water get boiled off when your engine is at its proper operating temp. So dumping it back into the crankcase does no harm.