Hey, I've seen some topics that talk about these K & N oiled reusable air filters not being approved by a lot of OEM engine manufacturers, especially in the diesel forums. The claim is that these filters let in more dirt with the improved air flow. I am under the impression they are blowing this way out of proportion severely and here's why:
I have a gas burning light truck that has had a K & N in it since before I owned it. Now it has almost 200,000 miles on the engine and it doesn't even burn oil! That's a lot of miles for a gas engine! I've overhauled lots of engines in my days and have never seen any engine last anywhere near this long that has been getting much of any amount of dirt in it! On top of that, I don't even clean or "regenerate" this filter near as much as it is recommended.
I think K & N has been getting a major bummed rap here.
I know that getting the sulfur out of the fuel has had a major impact on engine life, but dirt is dirt and no engine will last long if dirt is getting in.
I also use full synthetic oil, but that won't save you either if dirt is getting in.
I need to make a post on synthetic oil, I'm a firm believer in it and with good reason. My late father was a chemical engineer that designed many refineries and chem. plants. Hydrocarbon science has progressed considerably in the last 40 years.
Speaking of that, where did that 26 cents a gallon gas go! When I was in high school, I could fill up for less than $5. Now days that will just buy a gallon.