I was reading about using a breather filter on the intake and leaving the hose from the valve cover hanging there. I was thinking of this only so oil wouldn't get into the intake and gunk up and reduce efficeny of the engine. But couldn't you take the hose off completely and put a filter on the nipple where the hose came from(valvecover) and where it goes to (the intake) or wouldn't this work. I know in the winter it would take alot longer to warm up but in the summer would it be useful at all? It seems like a good idea to me since oil/oil fume could reduce effective octane from what I read. Even if there were a filter of some sort in the hose that would be better than oil getting into the combustion chamber.