I purchased a 2013 GMC 3500 with a duramax diesel engine.....I filled it up, took it on a road trip down the interstate 65 miles to the next town then turned around came back and refilled it. 17.3 mpg.....so I installed a K & N filter expecting to better my mpg......Wrong answer my milage went down 3-5 miles per gallon. I wonder if I was expecting too much to even main tain the milage.....what went wrong? could the gas station fuel pump been wrong?

My sons both are mechanical, one had K&Ns' on his gas rig after awhile he removed and replaced with the original. Not good for him. Sorry to hear you spent your beer money on that one. The other son works in a shop and they have a trash can full of them.:h

Bad deal, good way to dust a motor.JR

JR45 wrote:Bad deal, good way to dust a motor.JRHow would you dust a motor with one of these?

I'm not a K&N fan personally; the design of the air intake may be a variable, but I had one on my previous 2002 Land Cruiser & upon taking apart & cleaning the manifold I was astounded how much buildup of fine dust was present.OEM paper elements in all my vehicles since. I'll trade cleaner air coming into my motors over a couple of HP @ WOT.Disclaimer: Others may have different experience with K&N, only relaying mine FWIW.

Let's too much dirt through.See it happen many times.

K & N filter change | Good Sam Community

135 Replies

Home_Skillet
Explorer II
Oct 27, 2013
Let's too much dirt through.
See it happen many times.
bmanning
Explorer
Oct 27, 2013
I'm not a K&N fan personally; the design of the air intake may be a variable, but I had one on my previous 2002 Land Cruiser & upon taking apart & cleaning the manifold I was astounded how much buildup of fine dust was present.

OEM paper elements in all my vehicles since. I'll trade cleaner air coming into my motors over a couple of HP @ WOT.

Disclaimer: Others may have different experience with K&N, only relaying mine FWIW.
noteven
Explorer III
Oct 27, 2013
JR45 wrote:
Bad deal, good way to dust a motor.
JR

How would you dust a motor with one of these?
JR45
Explorer
Oct 27, 2013
Bad deal, good way to dust a motor.
JR
janechucknicode
Explorer
Oct 27, 2013
My sons both are mechanical, one had K&Ns' on his gas rig after awhile he removed and replaced with the original. Not good for him. Sorry to hear you spent your beer money on that one. The other son works in a shop and they have a trash can full of them.:h

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K & N filter change

135 Replies

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