Back in the early 1950's, one of the shops in Nashville that was in competition with my father's shop built some Oldsmobile engines for the Daytona race, back when they were still running on the beach. Those engines were equipped with the best oil bath filters they could find, and all of them came back with a noticeable layer of sand in the oil pan. That much had gotten past the filter, and the piston rings. The engines were totally worn out from abrasive damage after 500 miles. I'll stick with my paper filter!
Jerry
