Is catch can needed ?
Race Director
Joined: Dec 2000
Posts: 19,304
Likes: 85
From: San Diego CA
Theoretically, yes and yes. As far as I know, no one has used one for 200,000 miles and then torn apart the engine to see how much less carbon has built up on the pistons, but essentially, an intake manifold was never intended to be sprayed with engine oil.
Dave
Dave
Melting Slicks
Joined: Feb 2003
Posts: 2,966
Likes: 22
From: Frederick Maryland
St. Jude Donor '08-'09-'10-'11
1) the engine burns the oil vapors
2) The pistons and the intake valves get coated with oil residue
3) The intake manifold always has some oil sitting in it
4) It just looks better
As for your other question, it can't be healthy for the engine to ingest all that oil!
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Le Mans Master
Joined: Mar 2002
Posts: 5,955
Likes: 161
From: PNW
If you drive mellow around town, then the amount of oil vapors will be much less.