The oil filter was on a 95 Integra GS-R. I noticed the dirty film after only two months... I never had the chance to clean and oil it, nor did I on the car before it, in which I never checked the intake plumbing.
If it was incorrectly oiled, it was at the factory.
I had a friend with a previous generation Integra. He had an interesting setup where he put his K&N on near the fender, but retained the stock box. I talked him into running a new cheapie fram filter in the stock box for a month over the winter (in payment of adjusting his valves for free). When we took it out it was surprisingly dirty, and looked a little pink. That was it for me and K&N!
[quote:c75bfaa922="sspiller"]Interesting observations, K&N claims that if you get any oily grit down stream from the filter it was incorrectly oiled (which is a common problem). Their data supports better airflow and equal or better dirt filtering properties then stock paper filters... I guess it is one of those preference things.[/quote:c75bfaa922]