DeTomaso Mailing List: September 2000, Message #183

snip.....
<Independent studies on fleet vehicles have shown that the use of K&N filters (specifically) to achieve cost benefits through increased performance, mileage or other
perceived gains, has been more than offset by added expense on the maintenance end of their budgets.>

Increased airflow with the same driving force into the same size inlet has to mean less inlet restriction and maybe less actual grit-removal. K & N are vigorous in their defense of their product, though, which seems to work OK on my dirt bikes, as long as its cleaned & oiled regularly. That seems to be key: K & N say not cleaning & reoiling enough (per directions) for your local conditions constitutes "misuse of the product". IMHO, most people won't even inspect the things regularly, much less wash & re-oil. Dave Doddek, what does Caterpillar use on their earthmover engines, and whats the freq. of engine repair?  Cheers- J Deryke