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Message: [QUOTE="713Diesel, post: 465872, member: 7173"] I would look at the exhaust pipe upon initial start up and see if any smoke comes out. On a stock truck with all the emissions stuff I believe it should be clear. Make sure it hasn't been conveniently been warmed up for you when they do start it up. There is also an option on the gauge cluster to have a "test" or "system check" or something along those lines that it will go through a few things in the display and show how many hours are on it. There has been some talk going back and forth on if you have X amount of miles there should be approximately X hours. If the hours don't line up with the miles it might be from idling too long which from what I have read can cause some damage on a non DPF deleted truck. I would ask the guy how often he does oil changes. Obviously you will have to take his word on this. Anything over 5k on a stock truck is not good due to the amount of fuel that can get into the oil on regens. Also ask him if he has changes the diff fluid, trans fluid and coolant. Seeing that it was a fleet vehicle most but not all places stretch maintenance intervals longer than they should. Also figure out what kind of fleet vehicle it was. If it was an in town delivery truck there is a pretty good change that a good chunk of the miles are city and it has been idled a bunch Unless the price is just a super great deal I would be hesitant to buy a truck that had all the emissions (DPF) equipment still on it. I would keep the thought in the back of my mind that there would be a good possibility that in the foreseeable future you might need a new engine. Not trying to scare you away from it but all of this is just my .02. [/QUOTE]