Installed my Needswings Oil Catch Can yesterday, which went smoothly in no small part to the excellent how-to provided here.

My question is to those that have installed one.....How often do you need to empty the catch can (and what is the capacity since the can is chambered)? And....What happens if it fills up?

I realize driving habits will influence the answer to the first question, but just looking for an average guestimate.