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black2003
Dodge Dakota
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4/18/2004
18:48:29
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 Subject: Why do air filters need oil
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Why do K&N or even foam filters like tru flow require oil?
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another mark
Dodge Dakota
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4/18/2004
19:40:33
| RE: Why do air filters need oil
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so that they can trap the dirt, cotton gauze is very porous
compared to the paper air filters so it needs a clinging agent
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Mark
Forum Moderator
4/18/2004
19:44:32
| RE: Why do air filters need oil
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Its also believed that a small film of dirt trapped in the K/N also helps filtration. I let mine go quite a while w/o cleaning.
-Mark Hryckiewicz
1993 Sport RC SB 5.2L Auto
Mark.DodgeDakotas.com
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black2003
Dodge Dakota
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4/18/2004
22:03:05
| RE: Why do air filters need oil
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but then doesn't oil get sucked in too?
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another mark
Dodge Dakota
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4/18/2004
22:06:09
| RE: Why do air filters need oil
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you let the oil dry i think like 20 minutes before installing
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cool
Dodge Dakota
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4/19/2004
14:58:58
| RE: Why do air filters need oil
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Not to be a smart a$$ but oil doesn't really "dry" on the filter. What happens is that the oil is absorbed into the cotton filter material. The cotton has a microscopic weave that lets air through but traps any particles trying to pass through. The oil helps to hold these particles and as it builds up it is supposed to actually filter better.
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Mr.Sleepy
Dodge Dakota
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4/19/2004
15:28:27
| RE: Why do air filters need oil
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The oil is what traps the dirt, the cotton simply holds the oil in place. This is the reason why K&N's are washable. Paper filters are fine enough to capture dirt but cant be washed, they fall about when soaked. The oil acts like a liquid paper filter attached to the cotton, when the oil gets too dirty you just wash it away. For $50 you buy a drop-in K&N air filter and actually begin to save money within a year. Most K&N Recharger kits/Cleaner kits, are $15-25 depending on where you shop. The kit will last the life of the filter.
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