Originally Posted By: chubbs1
Ask Member "BarlowC", he has an Altima he uses a K&N air filter on and it has served him well.
As chubbs1 says, I have a K&N on my 2008 Altima. I bought the car new and dropped the filter in when I got it home from the dealer. My two UOAs (see
here) don't show any signs of anything but fine air filtration. Silicon particle counts were at 12 and 13.
I also have a K&N in our 2007 Saturn which has a Honda V6 in it. Similarly, I dropped a K&N in it shortly after getting it home from the dealer. The one UOA I've had done on that vehicle (see
here) had a Silicon particle count of 14, so again, indicative of fine air filtration. (I'll have a second UOA in about a month and am anxious to see the results.)
Prior to these two vehicles, I ran K&N filters in my a) 1998 Pontiac Grand Prix GTP which had a supercharged 3800, and b) 1999 Pontiac Grand Prix GT which had a naturally-aspirated 3800. While I never had UOAs done on those vehicles and therefore don't know what the Silicon levels were, I never had any problems with the K&N filters new out of the box, or after cleaning and re-oiling them.
With all that said, if I bought new vehicles today, I would probably just stick with good paper filters. But until I see any indication of the K&N not performing well in my current vehicles, I'll probably stick with them.