"ASME (mechanical engineering society) did a study years ago for diesel air filters for earthmoving equipment. They found the best is a folded treated paper system FOLLOWED by an oil bath system (a la aircooled bugs) AND regular maintenance. They rated the filtration properties of the K&N oiled foam type as poor. They were not concerned with HP/MPG only with preventative maintenance." Just a note here: In several of these posts like the one above, the K&N has been referred to as "oiled foam". It is not an oiled foam type element, and that is a signifigant detail. Filters such as the UNI-4 are foam, the K&N is cotton fabric layered between steel mesh. - Ed |
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