stacy:all three diesels have been decent the last five years.the 6.0 had its problems,but so did the duramax at first.and the pre 03 5.9's [24v] had terrible inj.&lift pumps.my opinion of the best of anything is how long it lasts and how close to performing like it is new while it lasts.the 5.9 is definitely that motor.it can take more abuse than any other diesel ever put in a light duty pickup.w