Well I have been reading a lot and doing my research. I have a perfectly fine 06 f150 crew cab 4x4 lariat with 85000 miles that I'm About to trade in on a 2005 f250 king ranch 4x4 crew cab SWB with a 6.0. The truck has 167000 miles, interior is kinda dirty but not terrible im just super clean, driver seat is tore where they all tear on the driver side. Now for the engine, I know the used dealer is fed up with me. They have had the truck since march so there making a deal. Initially they has 3 bad injectors back in march, #2,#2,#8. The mechanic changed all 8 injectors and put a new EGR valve, changed rear brakes. 3800.00 dollars worth and I have the invoices from the mechanic. They put some new tires on it also for 1000.00 again have receipt. They took the truck on trade at 12000 and were selling at 18990 I have them down to 16800 and they are giving me 16000 for mine. So all in all I'm only financing 12000. Now I'm super nervous about buying a 6.0 like I'm sure everyone else was when buying used since you don't know how it was maintained. Well I like to research so I first got a osasis report. It showed regular warranty work no major fixes no head gasket repair, no egr issues or oil cooler issues. Service manager said usually if they abuse them at 30000 miles there in there for repair. Next I brought it to a well respected diesel mechanic in my area. He specializes in repairing 6.0 and 6.4 and beefing them up. He did all kind of diagnostics on a laptop which I never saw and thought was pretty cool. He said 3 glow plugs were bad, bad abs sensor front driver side, plus a bunch of electrical codes. He said electrical codes could be from working on truck with ignition on and unplugging wires etc. plus I drove it for 100 miles and didn't have a single issue. Truck runs smooth and shifts great. In my opinion it's strong still. Now the main thing I was concerned about they had a leak start when I got home with it test driving and brought to that mechanic. He checked it out said he would have to pressure wash area with motor cool then monitor a couple days. He said it could be as small as a glow plug oring or a rocker box gasket. He couldnt tell but that's what he said it looked like. Well I brought it back to the dealer and told them I want the truck but I was not buying it with a oil leak and I told them about the glow plugs. They brought the truck Friday to there mechanic and he replaced the bad glow plugs and is fixing the leak. I asked what the leak was but the dealer said they didn't know but total was going to be 500. I will find out tomorrow and I am also getting a car fax tomorrow. So now I told them I want to test drive again all day Monday and bring it to another mechanic " which is a ford dealer but they are top notch on the 6.0 engines " I called the services manager and just what he told me they check impressed me. So tuesday I should know all good and bad news. Sorry for being so long winded I just wanted input from other 6.0 owners before I jump into it. I have never owned a diesel but always drove them from working on farms to construction to messing with diesel engines offshore. I'm mechanically inclined and build gas motors and currently rebuilding a 67 camaro. But by no means know everything about anything. So I like advise on my decisions. So if you think a 6.0 with 167k is a bad idea let me know and appreciate any advise. Look forward future post thanks.