The 1st and 2nd generation 5.9L Cummins Trucks are notorious for leaking oil pans. Most people shy away from trying to repair these leaks as it is not the most enjoyable jobs to do. Although repairing this will not add any horsepower, the satisfaction you will get from no longer leaking oil on your driveway makes it worth it. Repair your leaking oil pan with a Cometic Oil Pan Gasket. This is a direct fit Cometic gasket and will seal your oil pan the right way stopping those annoying oil leaks.