Why would you wait? I've had the Damond catch can for over a year and about 25,000 miles. Zero problems... very easy to drain and catches a lot of gunk in the winter. It gets down into the 30's in the winter and out to 117F in the summer and not had a single problem. Getting alerts in my email on this thread it's like a 99 to 1 vote for the Damond can... seems to be the best to me, despite not having a cool glass viewing gauge. If your can fills too much, something's probably wrong with your car. I drain mine every 5,000 miles and it's never been full enough to worry about the level of gunk collected.