Ha ! I didn't even realize I was the one who said that. I suffer from CRS. I'll tell you about my experience. After I installed my K&N's I left the crankcase vent hooked up to the air box. I keep some tools, fuses, wire etc. in there wrapped in rags so they don't rattle. The rags smelled strongly of oil. Next, I put on the little filter. It's a little C-S'r to install. Over time, oil mist covered the back of my engine. Then dirt stuck to that and looked bad. It also made pulling the engine for repairs a filthy mess. Also the little bastard filter is supposed to be removed and cleaned periodically which is a PITA. I put a hose on mine and ran it up and fed it into one of my K&N's. It's been like that for a long time with no ill effects.