if it's a true oil bath unit why not use oil like it was made to? if it's a paper filter i would take it in to any parts shop and they should be able to find one that will work at least temporarily. my hudson has a wire mesh unit that can be cleaned and reused. i have had other trucks that just used oil and oil only on a oil bath unit. i think oil bath units work well and no need to buy anything except sae 30. i'm sorry, i see k&n all over the place and i know they are suposed to be important or something but i know nothing about them, good luck!
