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Does Engine Oil Evaporate?

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Oddman Profile
Oddman answered
I assume you are concerned with oil in the open air, as opposed to being enclosed in a sealed space. It has certain volatile components that will evaporate. (That's why it has a smell.) The remainder will get thicker over time as the volatile components disappear. I suspect it may not evaporate completely--the way water does, for example. It will probably leave behind a varnish or sludge. Heat or light will speed the process.
dan cooper Profile
dan cooper answered
Engine oil won't evaporate, however it can "blow" out if the crankcase is'nt vented properly such as a failing or plugged up pcv valve. Also some engines "burn" or use oil with worn rings ect.

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