Whats the best cure for a leaking drain plug? the usual gasket just doesnt seem to work. Will that white tape (cant think of actual name) put on the threads stop it or will i need a gasket sealer? This is for a 98 ford e-350 with a 7.2L i beleive diesel. Will be doing an oil change next week so looking for the best tip to stop this as it usually starts leaking again after a month.