FOR DODGE RAM 2500/3500 PICKUP L6-5.9L DSL; 2003-2009. Air Filter Shape Rectangular. Air Filter Material Cotton Gauze. Filter Re-Oiling Amount 8.3 oz (245 ml). CLEAN ONCE EVERY 5 YEARS: Engine air filter only needs cleaning every 75,000 miles under normal highway driving conditions (5 years based on the average miles driven per year of 15,000 miles).