Advice on aftermarket air filter for '08 F250

elginfarm · Sep 20, 2012

Hi everyone,
I am looking for suggestions on an aftermarket air filter for my 08 F250 with the 6.4L diesel. I am comparing K&M, AFE and others.
Your experiences and advice would be appreciated. I am mostly looking for a boost in MPG.
Thanks, Eldon

scrappy isb67 · Sep 20, 2012

elginfarm said:
Hi everyone,
I am looking for suggestions on an aftermarket air filter for my 08 F250 with the 6.4L diesel. I am comparing K&M, AFE and others.
Your experiences and advice would be appreciated. I am mostly looking for a boost in MPG.
Thanks, Eldon

I would not buy an oiled filter. make sure it is one of the dry filters. Personally I like the AFE products and it is what I have on my Cummins

Diamondpilot · Sep 20, 2012

On all my Diesel Fords I have ran MAC Air Filters. On my Dmax, my Titan, and a few F150's I have run K&N. All give great results.

The mpg gain will be minimal at best. I have seen 1/2mpg or so.

Chris

PoorPlowboy · Sep 20, 2012

The air filter is not going to give you any MPG boost unless you're simply replacing a clogged one with a clean one. The OEM type dry filters the best. If you want the only logical economy boost, have you thought about an EGR/DPF delete and a program?

Diamondpilot · Sep 20, 2012

Yep, a EGR delete on Fords and GM's does wonders. I have seen 4 mpg doing this with a Quadzilla chip along with 4" exhaust and MAC intake on both my Ford 6.0's.

The Dmax got 2-3 mpg with just a simple 50 HP program and EGR delete.

Chris

94BULLITT · Sep 20, 2012

Alot of Ford guys run AFE. I don't know if you will see any gains with a intake on that truck. It has a big filter from the factory.

sld · Sep 20, 2012

I have run K&N's for 25+ years with no problems. Any gains? Probably not. But from an economical standpoint you can't beat them. Buy it once and never again.

The people that have problems with them use way too much oil. When I do my annual cleaning, I will let it sit overnight before I start it so it gets good and soaked in. Never had a single problem and saved quite a bit from buying paper filters.

scrappy isb67 · Sep 20, 2012

sld said:
I have run K&N's for 25+ years with no problems. Any gains? Probably not. But from an economical standpoint you can't beat them. Buy it once and never again.

The people that have problems with them use way too much oil. When I do my annual cleaning, I will let it sit overnight before I start it so it gets good and soaked in. Never had a single problem and saved quite a bit from buying paper filters.

straight out of the box(FACTORY OILED!) installed, drove ~8000 miles and the intake and turbo looked like someone fed it mud, turbodiesels pull too much air for a K&N, they will pull the oil out and then eat the dust that the too dry air filter can't stop.

WD40 · Sep 21, 2012

Just my 2cents.
Your stock air filter in the 6.4 is good up to 500 HP and it gives your engine good clean air.
I have a 6.0 and there is no way I would put a K&N on any of mine.
For better MPG's add a 4 inch exhaust, gages and a tuner.
Doug