I'd check your manual to be safe. It might be different for each truck depending on the configuration, cab, bed, gears, etc.....Since I'm new to diesel engines. Just wonderng whats the highest oil temps you guys are seeing when pulling a boat, rv, or trailer? So far the highest I've been seeing is 219 to 229 when pulling my boat up a bridge. Does anyone know what temp is considered to high or a danger zone for our EDs?