I didn't know whether to post here or in the medium duty/truck forum. I just bought a chevy luv truck with a Isuzu c223 diesel engine. I know nothing about the history of the truck but I don't believe it has been mantained well for the past couple of years at least. The truck has 125k miles on it. I know the truck has overheated before, because when I bought the truck it overheated badly. I flushed the radiator and a lot of junk came out. I was looking for some suggestions on some oil for this engine. I've looked at this site, but don't understand all the language so laymans terms would be helpful.