R_Lefebvre
Expedition Leader
After reading K&N's air filter warranty I don't think there's anything you can use in their defense. If you use your vehicle off-road it voids the warranty, even for the filters they make for dirt bikes.
Basically they are saying, "If you use our filter for the application it's specified for, the warranty is void."
I'm not concerned with K&N's warranty. We're not discussing the filter failing. I won't run one because of their poor filtering efficiency, not because of the alleged MAF fouling. And the only warranty they are talking about, is the one on the filter. Not on the vehicle.
The question is does K&N cause MAF's to fail. K&N has a pretty interesting report on the subject. Biased? Maybe. But it's an interesting read:
http://www.knfilters.com/MAF/massair.htm
Sure, that report could be biased. But, so are Service Advisors. Dealerships make a lot more money if they can get the customer to pay for the repair, rather than warranty. They have an incentive to deny any warranty repair they can. If they can blindly blame it on K&N, they will.
As I said, MAF go bad all the time. My MAF just went bad, couldn't be cleaned, and I have always had a paper filter. The internet is full of discussion across all car brands, about MAF's going bad. They are not an unlimited lifetime part. It's just a fact of modern cars.