Looking to buy a T450 track loader and would like the good, bad and ugly. Is the Doosan a good motor or problems? Machine is a 2015 with 2500 hours on the clock. Dealer replaced injectors and waiting to have it "Tuned". Someone supposedly filled it with gas and took out injectors. Seems to run and drive ok just needs tuned. It is at a used equipment dealer. Thanks for any information.