K&N Air Filters Destroy Diesel Engines!!!! - Diesel Forum - TheDieselStop.com
Power Stroke Excursions Technical discussion of the Ford Excursion SUV with the Power Stroke diesel.

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post #1 of 5 (permalink) Old 08-13-2002, 11:10 AM Thread Starter
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K&N Air Filters Destroy Diesel Engines!!!!

...is what my local Ford Dealership Service Dept. advisor told me today. He said that they have had two PSDs with only 25,000 miles on them that were destroyed by K&N air filters. He further mentioned that K&N have discontinued their diesel air filters because they are so bad. AND, he said that if the engine gets hurt the warranty is voided since you aren't using the factory filters.

IS THIS BS? Sounds like it to me, but then again, I figure the good folks here can provide me with a bit more *accurate* information.

I love my K&N filter, and have had no problems thus far. I think this guy is just trying to scare me or something. What about his three claims (destroys engines, has been discontinued, and is not covered by warranty)...can anyone give proof to this?


1) 2000 Excursion PSD Ltd, 4x2, Dark Green, DP Tuner, Autometer gauges, AIS w/ Zoodad, ITP HP/X, Walker BTM, Dahl 100, Coolant Filter, 203 Tstat, Billet Tstat Housing, AIH delete, Hellwig swaybar, KYB shocks, Amsoil Bypass / fluids, Hutch Mod
2) 2000 Excursion PSD Ltd, 4x2, Chestnut, BTS Tranny, DI 4-Way Chip, AutoMeter CF gauges, AFE intake, Magnaflow 4" turbo back, Wicked Wheel, HP/X Crossover, KYB shocks, Hellwig rear swaybar
3) 99.5 F250 CC SB PSD XLT, 4x2, 3.73 LS, aFe Stage 1 intake, Zoodad mod, 4" turbo back exhaust, Amsoil
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post #2 of 5 (permalink) Old 08-13-2002, 11:28 AM
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Re: K&N Air Filters Destroy Diesel Engines!!!!

Tailgate -- I think your dealer's Service Department is feeding you some BS.

Do K&N filters destroy engines? Depends on who you talk to. [img]/ubbthreads/images/icons/wink.gif[/img]
Has K&N discontinued their diesel air filters? I doubt it. If they did that, wouldn't they have to discontinue all their air filters?
Can your (engine) warranty be voided by using a K&N filter? That depends on the dealer.

K&N did have a problem with their filters sealing on the '94-'97 Power Strokes but I am unaware of any similar problems with the '99+ Super Duties. What a lot of people do is keep a spare 'factory' filter and install it when taking their truck in for service. [img]/ubbthreads/images/icons/smile.gif[/img]

Cheers from Tulsa, OK! [img]/ubbthreads/images/icons/smile.gif[/img]

1996 F-350 XLT CC SRW 4x4 BTS-E4OD●4L10●Tyrant Diesel chip●Hypermax H2E, intercooler, exhaust●TE-T500●7.3L Regulated Return Fuel System●215 amp generator●International water pump●Hydro-Boost●APCM 250,000 happy miles
~~NTxPSA - Hold my beer and watch this.~~
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post #3 of 5 (permalink) Old 08-13-2002, 11:38 AM
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Re: K&N Air Filters Destroy Diesel Engines!!!!

Pull the intake hose off of the turbo and look at the impeller blades. If the blades have dirt and oil on them then you are probably over oiling or the airbox is not sealed and pulling in unfiltered air. The dirt and oil would be the only way the K&N filter would ruin an engine. Turbo charged engines suck much harder than a naturally aspirated engine, and if the filter is overoiled it will pull the oil into the turbo and thru your aftercooler. [img]/ubbthreads/images/icons/blush.gif[/img]

1996 Dodge club cab, Cummins Diesel 4X4 5sp, White 2000 XLT Excursion 4X4, Hypermax chipped,3.5 down pipe to a 5" exhaust, K&N air filter, Hypermax intercooler,loaded
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post #4 of 5 (permalink) Old 08-13-2002, 11:38 AM
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Re: K&N Air Filters Destroy Diesel Engines!!!!

Dave I may as well join the clan and get a backup stocker for the"just in case"situation [img]/ubbthreads/images/icons/grin.gif[/img]But I'll stand by my K&N's [img]/ubbthreads/images/icons/smile.gif[/img] BILL

2002 Ford Excursion 7.3L 4x4 XLT

BTS Transmission, 6.0L cooler, 13" PI Stallion TC,
Magnaflow 4" ,FRX ,CVD Valving, Bilstein 5100 shocks,AFE Stage 2,Adrenaline HPOP
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post #5 of 5 (permalink) Old 08-13-2002, 04:13 PM
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Re: K&N Air Filters Destroy Diesel Engines!!!!

Don't have the source anymore but there was a pit minning company that did a study on going to K&N's

Would have saved them literally millions of dollars in filter cost over the life of the program.

To make a long story short the K&N's on the test units wreaked havoc with the oil analysis... Something about high silica levels...

I run K&N's on my gas engines but never on a turbodiesel

Chris Brandt
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