REVEALED! Diesel Inlet blockage happens in EVERY common rail diesel. In well under 100,000km - your 4WD engine could be clogged, losing power and not cooling as well as it should. In this video - we show you why and how it happens - and the best way to prevent it - which is a quality Catch Can. We talk to 4WD filtration experts - Mann and Hummel - who give you the in-depth info you're looking for!