Mine just rolled over to 174,000 this past weekend, as Dave said make sure it's been driven and towed some pretty decent loads to get the turbo nice and hot so it burns all the soot out. I Bought mine in 2008 with 123,000 miles on it and replaced the turbo shortly after taking delivery of the truck(it was just worn out). I have also done two injectors, FICM, EGR delete, turbo back exhaust, and I'v stopped using the dealer recommended 5W-40 and started using Rotella 15W-40 changing it every 5k with fuel filters every 10k. I've also been running IDP's Extreme Street tune for most of the summer and the tow tune when towing our 5er and I have not had an issue at all but just make sure you have some gauges to monitor the Trans temp, EGT's and boost. I fully expect this truck to make it to 350-400k and the body is still in good shape with just a few little rust spots underneath I need to address next summer.
This is what it looked like the day I drover her home from the dealer.
This was taken this summer, not bad for a six year old truck that's towed and worked all it's life. The previous owner is just as anal as I am about doing PM's and taking care of his equipment.