Paper filter elements will do a lot better job of cleaning the air. Back in the early 1950's one of our competitors built a couple of Oldsmobile engines to run in the Daytona race, back when half the track was run down the beach. When they tore the engines down after one 500-mile race, the rings were worn out, and there was a residue of sand in the oil pan that had gotten through the oil bath filter and past the piston rings. The engine was nicely polished inside, though!
Jerry
