Hi. Maybe someone has said it, but I would recomend adding a can of Rislone cleaner to the oil before changing it. Let it idle for 1/2 hour , rev it up every few minutes, then change oil and filter. If needed, put a big fan in front of the radiator. '58 Plymouth - "Christine", '59 DeSoto, '60 Imperial cnvt, '60 Fury cnvt.