I love my 250 7.3. I now have only 174,000 miles on her. I have put a lot of money into this thing to keep it going so far. Tranny rebuilt twice, replaced the entire front end including PS pump and gear box and all the other little things that go wrong. I have kept up with all the fluid changes and filter changes and flushes. The only thing that has really gone wrong with the engine itself is the turbo. I blew it out last year. I regular run a diesel treatment/fuel injecor cleaner through it. Is there anything else that I need to do to keep the engine running strong forever? I have never messed with the injectors besides the additive. Is there a maintenace rutine on the engine besides oil changes and fuel filter changes that I need to be doing?