wow mister negative. There is no problem with K&N filters. You dont put that much oil on them. I have ran one in all of my vehicles and a few of them had over 300k miles on them with no problems. And with the positives of the K&N you would be dumb not to get one. i mean $40 for a filter that lasts forever VS $15-$25 for one you have to change at least once a year? I am sure that if the oil caused a problem with the Maf then the recurculating oil and air mix from your valve covers that go back into your filter box would have a problem with it too on cars that have that feature.
As Leaann stated, its not negativity. K&N filters should not be used with MAF, even if you oil them a little bit. The first thing that happens with the MAF once it gets dirty is that your fuel economy goes south. You say you didn't have any problems, really how would you know? Did you monitor you fuel economy for the period of time the K&N filter was on and then for an equal amount of time, run a normal filter?
I just find this argument odd because if you talk to a K&N rep, they will talk to you about possible contamination from crankcase oil, possible bad components from the factory or even use an analogy to using a paper towel to blot extra grease off a pizza. What?
1. Possible contaminates from the crankcase oil. The funny thing with that is there was never a problem until after the K&N was installed. And in most cases I've dealt with the problem went away with a good cleaning of the MAF and of course removing the K&N filter. In a few, the MAF needed to be replaced. Blaming crankcase vapors for the oiling of MAF is not based, seeing how their isn't some mass TSB or recall for oily MAFs from the factory.
2. Possible bad components from the factory. Right, and people who have bad components already just happen to be the same people installing K&N filters on their daily drivers. The percentage is pretty high, just in the Northern Illinois area alone.
3. Sure, blotting a piece of pizza with a paper cloth absorbs the grease and doesn't let go. But then did you try blowing thru that paper cloth. The grease sure comes out then. Come on.
See, you are getting me wrong here. I love my K&N filter. I will never use anything else. I don't have a MAF, hell, I don't have fuel injection. No problems on my end.
What recirculating oil/air mix are you talking about that goes thru the MAF?