Stock the contaminants get burned back off in the intake. With a catch can you are storing them which is why they could freeze up. I think as long as you keep up on draining it you shouldn't have any problems.
I ran a catch can on a gti I had a few years ago and I forgot to empty it over the winter. It froze up, clogged my crankcase breather, built up a ton of pressure and shot a bunch of oil out of the dipstick tube lol. It didn't cause any damage but scared the hell out of me!
I ran a catch can on a gti I had a few years ago and I forgot to empty it over the winter. It froze up, clogged my crankcase breather, built up a ton of pressure and shot a bunch of oil out of the dipstick tube lol. It didn't cause any damage but scared the hell out of me!