The crankcase filter on my car leaks a little oil, mostly during long periods of boosting.

Can I cap that ?

If not I guess I will put a filter on it with a 90 deg bend going up.

ramius and I looked at it and he seems to think it can be capped.

I honestly do not know enough about engines to know if it can or can't be capped.

 

I wouldn't...if you cap it the crankcase will not be ale to vent and pressure wil build up. why not install a catch can??