I have 260,00 on my 95 and it still runs well but I'm retiring it, I just bought a 1998 cewcab dually and its getting new injectors, glow plugs a relocated PMD and eventually a fluid damper, a set of gauges and an upgraded lift pump. It has only 135,000 on it original. I think its a good engine all cylinders are coming up to 390 except for 5 is at 360?? ... Time will tell but I love the truck. I love the 6.5, especially for all the highway I do.