Originally Posted by 02 LW300 (Post 53103)

Along time ago when I was much younger, I ran a Filtron sock type filter on my dirt bike. I serviced this filter before each trip to the track. This was cheaper than replacing a paper element before each ride.
Now let's talk about a vehicle you drive every day. I don't want to have to open the hood between oil changes. Just about every time I see a K & N filter it is dry and filthy. So much for good filtration, it is the oil that catches the dirt. As soon as they dry out guess where all that dirt goes.
I have a good relationship with the Ford dealership in my city. We have a fleet of 135 trucks and there are at least 100 Fords. If a Ford Diesel comes into their shop with an aftermarket air cleaner setup for any warranty work. The first thing they check is blow by, if an engine is "dusted" the warranty is VOID.
You choose.