> I've been seeing filter type gadgets that you connect to the pcv valve
> which doesn't allow oil or oil fumes back into the intake manifold but
> rather out into the atmosphere. I was wondering if they give you more
> power, or a cleaner engine or what? My father was telling me he had
> cars back in the '50s that had similar filters that you'd have to
> clean out every so often, before there were pcv systems.
> Any insight on this thing is appreciated.
A little cleaner engine, as well as helps keep blowby oil out of the intake. (Less blue smoke out the exhaust that way, on higher-mileage engines.)
The JDM engines have that valve cover outlet vented to atmosphere with no filter at all. So you could pretend you live in Japan and just do that if you want. It's possible no filter makes the oil get a little dirtier quicker, but I never noticed any difference.