First of all - what's been done to this engine already? Have all the known problems been fixed? A lot of the bad press comes from a misinterpretation of what went wrong. A lot of head gaskets were replaced when the problem was a clogged oil cooler causing an EGR cooler breakdown. Get the OASIS report for it. Before buying hook up a guage (SCT, BULLYDOG etc.) and take it for a hard drive with a load. Watch the difference between the Engine Oil Temp and the Engine Coolant temp. They should not be more than 15 degrees apart. If they are - skip on this truck. If not, then you are probably OK. Yes there are things known to go wrong with this engine that should not be, but they are all known and all can be addressed. If you are getting a premium no rust loaded to the hilt and no accident vehicle for a real good price - and - you are prepared to address the known problems then why not? If you really want to be sure, make a deal with a local Diesel shop to get everything done, studs, new oil cooler, new EGR or EGR delete, and a set of guages to monitor the engine with you will wind up with a known quantity that you can rely on. Should cost you less than 5K to take care of evrything.