You decide. Last week I towed the TT to Myrtle Beach. On the way down I kept wondering WHY my MPG was so low. Everything felt fine, no extra wind, but worse than usual MPG. I usually get 10, to the beach, and 9 1/2 home I barely got 9, actually high 8. Same thing on the way home. WHAT was the difference, what was wrong?Then yesterday it hit me. My K%N filter was dirty, And I didn't have time to clean it before we left, and besides, they don't help anyway, right. So I bought a Fram air filter, and stuck it in. Result. Loss of MPG. Could tell no difference in power.Well the K%N. Is being cleaned even as I type. It's goin back in. One MPG may not seem like much, but, it's alot when you ain't gettin none to start with. and in my truck, it's 27 miles

I did a lot of research on the K&N and came to one conclusion, NO WAY Jose. It filters LARGE particles only and allows the fine dust to enter the engine, which will kill an engine very quickly. If they were as great as they claim, why doesn't the vehicle manufacturer make them OEM, to boost the HP & torque..:?

Terryallan wrote:You decide. Last week I towed the TT to Myrtle Beach. On the way down I kept wondering WHY my MPG was so low. Everything felt fine, no extra wind, but worse than usual MPG. I usually get 10, to the beach, and 9 1/2 home I barely got 9, actually high 8. Same thing on the way home. WHAT was the difference, what was wrong?Then yesterday it hit me. My K%N filter was dirty, And I didn't have time to clean it before we left, and besides, they don't help anyway, right. So I bought a Fram air filter, and stuck it in. Result. Loss of MPG. Could tell no difference in power.Well the K%N. Is being cleaned even as I type. It's goin back in. One MPG may not seem like much, but, it's alot when you ain't gettin none to start with. and in my truck, it's 27 milesIf you think about it, what you are saying is impossible.Modern engines have MAF or MAP and O2 sensors in them. These sensors keep A/F mixtures EXACTLY at 14.7 and is updated hundreds of times a second.The more air you get into an engine the more fuel it will inject to keep it stoichiometric. The less air the less fuel it will inject.So even if your K&N filter gave your engine more air it also needed more fuel to go with it.You don't get better mileage by burning more fuel. A lot of things can cause poor mileage.You can make the argument you got more power, but not better fuel mileage.

I feel Frame is a poor choice for an air, fuel, or oil filter. Too many posts about them coming apart and causing damage. As for the K&N, My truck had one when I bought it but again I didn't feel comfortable with it as it is necessary that it be oiled properly and more often than I would like, so it sits on the shelf and a stock air filter is in. I use Wix and so far all is good. JMO.

Very Very carefully clean your MAF/MAS grid. It is possibly contaminated with oil from the K&N filter.

Out here in dusty west Texas the diesel mechanics do not recommend using a K&N. The heavy duty stock filters protect the engine better. They do require more frequent replacement if the dirt is blowing.

K&N air filters, help or not | Good Sam Community

35 Replies

Bonefish
Explorer
May 01, 2013
Out here in dusty west Texas the diesel mechanics do not recommend using a K&N. The heavy duty stock filters protect the engine better. They do require more frequent replacement if the dirt is blowing.
donn0128
Explorer II
May 01, 2013
Very Very carefully clean your MAF/MAS grid. It is possibly contaminated with oil from the K&N filter.
powderman426
Explorer
May 01, 2013
I feel Frame is a poor choice for an air, fuel, or oil filter. Too many posts about them coming apart and causing damage. As for the K&N, My truck had one when I bought it but again I didn't feel comfortable with it as it is necessary that it be oiled properly and more often than I would like, so it sits on the shelf and a stock air filter is in. I use Wix and so far all is good. JMO.
Turtle_n_Peeps
Explorer
May 01, 2013
Terryallan wrote:
You decide.
Last week I towed the TT to Myrtle Beach. On the way down I kept wondering WHY my MPG was so low. Everything felt fine, no extra wind, but worse than usual MPG. I usually get 10, to the beach, and 9 1/2 home I barely got 9, actually high 8. Same thing on the way home. WHAT was the difference, what was wrong?

Then yesterday it hit me. My K%N filter was dirty, And I didn't have time to clean it before we left, and besides, they don't help anyway, right. So I bought a Fram air filter, and stuck it in. Result. Loss of MPG. Could tell no difference in power.

Well the K%N. Is being cleaned even as I type. It's goin back in. One MPG may not seem like much, but, it's alot when you ain't gettin none to start with. and in my truck, it's 27 miles

If you think about it, what you are saying is impossible.

Modern engines have MAF or MAP and O2 sensors in them. These sensors keep A/F mixtures EXACTLY at 14.7 and is updated hundreds of times a second.

The more air you get into an engine the more fuel it will inject to keep it stoichiometric. The less air the less fuel it will inject.

So even if your K&N filter gave your engine more air it also needed more fuel to go with it.

You don't get better mileage by burning more fuel. A lot of things can cause poor mileage.

You can make the argument you got more power, but not better fuel mileage.
The_Texan
Explorer
May 01, 2013
I did a lot of research on the K&N and came to one conclusion, NO WAY Jose. It filters LARGE particles only and allows the fine dust to enter the engine, which will kill an engine very quickly. If they were as great as they claim, why doesn't the vehicle manufacturer make them OEM, to boost the HP & torque..:?

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K&N air filters, help or not

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