My grandpa bought a new 03. had an injection pump leak about 30,000 miles-dealer replaced pump. now it has 87,000 miles and is leaking again. this truck has been serviced on a very tight schedule and has NEVER had a fueling box or any performance upgrades at any point in its life. He ocassionally pulls his 32' travel trailer but it isnt that big of a strain and he doesnt drive it very hard