Sorry to revive an old thread but it's been a year so & I'm the OP so I thought I'd give an update. I did make a mistake buying this truck. If I had known then what I know now I would not have bought this particular truck, but I'm fine with a 6.0 in general.
The first issue was with the IPR - I paid the local Ford dealer $700 to fix it and that is the only time it will ever darken their door. So far I have had to replace the EGR cooler with the lifetime guaranteed one from Bulletproof Diesel. Since I was sending them money and had the truck that far apart I purchased the external oil cooler as well, about $2k for the whole deal. I did the work myself and it was easy enough. I cut my old oil cooler in two with a sawsall and it was clean inside, no sediment or sludge. Probably money wasted but I'll never have to worry about that problem.
While the truck was apart I found out the FICM was a BDP aftermarket one put in by the previous owner so I figure it should last. They seem to have a good reputation. The only negative comments I could find about them was the cost of their parts.
I had to buy batteries. That is expected with a used vehicle.
I had to do a complete brake job including new calipers because I could not get the pistons to retract. I've never seen calipers in that bad of shape.
The ICP sensor failed and was replaced, as well as the EGR valve. I need a new CAC boot and I'm going to get one, someday...
My truck is a cab-n-chassis with the rear of axle steel tank. The aluminum paint used to line the tank delaminated so I had to replace the fuel tank. I put in a poly tank so I won't have that problem again. Lastly I replaced the fuel pump, apparently it doesn't like to suck aluminum particles. I've put in the blue spring for the fuel pressure regulator.
I have a weird issue with the cruise control - it only works for about 30 minutes a day unless it's cold then it lasts longer. I have no idea what that is about so I just do without. It's not the VSS because the speedo works and there is no ABS light, it's not the clutch switch or the brake switch because everything else associated with those two items works, plus I replaced them anyway. The clock spring is fine because everything else associated with it works. It's predictable with little variation and the cruise is mearly a function of the PCM, there are no cruise control parts like on the IDI.
Oil changes are expensive. Four gallons of oil, and it has to be good oil or it will run terrible. OEM filters since it's a patented design and aftermaket ones won't perform properly.
So, hind sight being 20/20, read up on these, monitor everything before doing the deal. If the seller won't let you do a test drive - a real test drive, not just around the block, move on somewhere else.
All that being said, and after I did all this work I am happy and I don't think I'll have any more problems for a while...