Talked to a diesel tech up here in AK and he stated that running synthetic up here isn't the greatest thing for our diesels. Says that since you have better lubrication, the motor isn't going to have as much friction, and not allow the fuel to burn as well. Is there any truth to this or is it just the opposite of what he says. I believe he mostly works on the other 2. Thanks for the help, just trying to decide what exactly I am going to run.