Paccar MP3 good or bad?

Did he get the full service history?

 

I drove one in a 579, with slightly less horsepower and a 10 speed. The only real issue I had out of it was a factory recall for a cam replacement. A bunch of PACCAR engines had it, but by 550k, if it was one of those engines, it would have been replaced. I actually liked the motor. It was quiet, had plenty of power, and was fairly fuel efficient, even pulling a reefer. It didn't do as well on winter blend fuel, but that's typical. I think my truck was a 450 mated to a 10 speed, and 8 mpg wasn't uncommon unless I was out west. Back east, mid 8's when loaded. Not sure if the 500 will get that good, a mechanic told me, the more horses you have, the more you have to feed them...but the 13 speed will help, especially if you run any mountains very often.