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After having an AFE drop in replacement filter for a year or so...I've decided it is coming off. In fact no more oiled filters of any type are going back on. I'll just run a stock Fleetguard filter without the foam and replace it as necessary.
After mine got pretty dirty, I decided to clean it. And I went exactly by the book taking special care to do things just right. I even had input from AFE on the technique. I didn't notice any oil in the intake tube prior to cleaning but there was some black oily residue on the turbine blades. I cleaned the blades very carefully with Simple Green and blue shop towels. I also cleaned the inlet to the turbo as it too had some residue.
I washed the filter properly and let it dry in my garage for two days. Finally I applied the blue (original color oil was gold) oil per spec and let it soak in for one day. After re-installation and 500 miles of driving...my turbine blades are once again covered black with residue. I can now feel an oil film in the intake tube.
Holding the AFE (mines the original, not Pro-Guard 7) to the sun reveals the pinholes everywhere. Heck...even a garage light shows them well. If I put the oil on any thinner I couldn't get any absorption or coverage of the media. Then my turbo wouldn't have a chance as the pin holes in the media would let alot through with no oil to trap it.
I've done what I was supposed to and don't like the results. I'm not giving up clean air for a little more flow. Flow which I probably can't use anyway as the only performance Mods I have are 275's. I'll keep an eye on the minder and change the Fleetguard filters when they are dirty.
Not knocking AFE...its just not working out on my turbocharged diesel truck. They have a nice product and quality is good. I just think the turbo is pulling the oil right out of it. And the pin holes surely contribute to the greater flow.
I once ran a BHAF. I didn't like the open element and the possibility of it getting wet. So I modded the stock air box by removing the boot and cutting the air hole as big as I could on that side.
__________________
91.5 D250 LE
Regular Cab, Red
Automatic
H1C 21cm housing
Stock Condition
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AFE Drop-In filter is coming off my truck!
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