Ive been an army Diesel mechanic for 8 years and believe it or not 3,142 miles is not low most truck crap out around there because they are beat to crap every day. ie starting the truck in -10 deg weather and then reving the **** out of them to get the heater warm. and the big one is dumping coolant in the oil and not telling anybody. the oil cap on those looks like your car coolant cap they top the engine off with cooland and drive them. basically they live very hard lives.