Quote:
Originally Posted by wstar
Don't recirculate the catch can fluids back to the oil pan, it's a bad idea. It's not just oil trapped in them, it's also blowby gas and other vaporized crankcase gasses, which means it's got a high amount of both raw fuel and combustion byproducts (carbon, etc) blended into it. Just smell it once when you're dumping the cans and you'll smell the fuel in it (and as noted above, it picks up a bit of water vapor too).
(Also: you'd be creating a vacuum leak and/or another PCV flow path if you hooked up open drains back to the oilpan, too).
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Indeed ... the whole point of doing them to start with was to keep all that stuff out of the motor. Seems a bit defeative to collect them just to put them back in. It is really not that hard to empty them, and only takes a few minutes.