Originally Posted by torchd
I have an oil catch can on my 2002 Trans Am. Basically what it does is it collects any oil that blows by the PCV before it enters your intake.
Bingo. There are more "advanced" ones out there that have steel or glass balls inside the container which are supposed to help deposits condensate better. The one I have is just an empty container with an in
spout and an out
spout at the top. I was shocked that it filled up that fast. I can't believe how much garbage gets pumped through the throttle. I had the breather line and the PCV line T'd into this one can, but I didn't really like the possibility that the PCV could flow down the breather tube (unlikely, but still). So last night I hooked the can pictured above exclusively to the PCV system and will probably get something smaller for the crank breather. I'm curious to see which coughs up more gunk anyway.
If you want to poke around more about how these work, google:
oil catch can
crankcase breather filter
enchanced pcv filter
crankcase breather filters are cheap and common, but are illegal in most states. They just vent everything out into the atmosphere and I've heard some guys complain that it mists oil all over their engines. I figure if you get a sealed filter you can keep the gunk out of your engine, and still be good for the environment all at the same time.