With that stated I have used (many years ago now) K&N oiled filters in an old 1990 5.0 mustang, a 92 maxima and my 2002 e46 330i. I admit this is my experience in the absence of correct scientific controls. I'm with Rick and Tom on this, Keep the stock intake and air filter.Īnd NASCAR racers don't go to NAPA to buy the filters for their 850 HP hot rods, because they need filters that can flow the required air.In my experience, I found no advantage to oiled K&N oil filters and only issues. In between changes, it was easy enough to just remove, knock any dirt dust off and re-install. And it was easier to just swap it out when needed. The factory intake flowed more air and had longer filter life then anything on the market. I eventually did some research and found out that at least for the LBZ, there was no better intake and/or filter on the planet than what was on the truck as supplied by GM. I saw no improvement in mileage or exhaust temps and had a noticeable drone at highway speeds. So I drank some more KA and ordered up a Banks tuner, turbo back exhaust and intake with the cold air intake option. In prep for the big trailer I did a lot of changes. Didn't really see any improvements and had no sensor issues or codes. I drank the "Kool-Aid" and put an AFE intake with K&N on my 06 LBZ. That is "just enough" of the correct oil to change the color of the material, not soak it. So proper oiling of a K&N is very important. Oil and sensors don't make good dance partners. On my high end motorcycle I have a K&N filter, but that is mainly because the offerings from Harley are just plain junk.Ī key point on both of the above is the lack of high tech sensors, in particular the "Mass Air Flow" or whatever it is called on your vehicle. These are big filters, as the diesels draw a lot of air and they are way more expensive then automotive filters. Boats have relatively clean environments and some don't even use real filters, just screens. On our boat, I have K&N's protecting two 410 horsepower Detroit Diesels. Personal experience here, and I am a certified auto/diesel tech. K&N filters, do enough searching and you will find just as many negatives as positives.
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