I went with a K&N and wash it every oil change.
I change both air filters every 10k miles and use fram,stp and such.
After I swapped to a K&N drop-in filter and a lighter cat-back exhaust (the one I had was lighter than the stock), I was getting around 22-24 MPG with my EcoBoost.
I change mine every year. Along with spark plugs and clean my filter’s (have k&N ones you don’t throw those ones)
Ive been using the k&n reusable filters, they have held up pretty well. Expensive.
I just put in the K&N drop in air filter and I notice surprisingly large throttle response. It almost makes the ascent feel like a lighter vehicle.
There was a "performance" K&N filter and lots of detritus in the bottom of the air box I scrubbed down the box, and it is looking fresh. Except for the super greasy valve covers and rest of the engine bay. Oh, and I'm getting rid of the K&N filter--never been a fan.
Removed the K&Ns for some new paper filters. It'll suck to lose the 10% horsepower gain but I'll try not to die trying to pass Ford Flex's on the highway without it. The air box had a bunch of dirt/scum so I cleaned that out too.
Yup, I already ordered a sinister diesel intake, the K&N really didn’t perform well on the truck, goin for more flow
In my experience they are a waste of money with risk of fouling MAF sensor. I’ve tried them in my diesels and gassers. I never once wasted my time cleaning and re-oiling a K&N. I just threw it out and went back to OEM.
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