having previous experience with the GM diesels the 6.5's have the best rep. the older ones had bearing trouble `91-`94, and then the first of the electronic pumps had a terrible time, but all in all a well maintained engine should last 200k, but the fuel system is the weakest link, I have replaced so many Injection pumps I lost count. the worst thing is when they sit for long periods without having the fuel treated. its so close to being a full organic that it grows bacteria in the tank, it then will travel through the system to create trouble like poor performance and then fuel starvation(whitch wipes out the lift pump & the Injection pump), if you treat your fuel about every other fill up with good additive(anti microbol) and never park it for long periods without treatment it might last forever.
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