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I have both. If I could go back in time and not buy the 6.0 I would. One of my 7.3 (IDI)as 450k miles on it only major work was head gaskets at 350k and tranny at 300k. The other 7.3 (PSD)I bought with 225k miles now has 256. Have done nothing but change fluids. Great truck. My 6.0 I am in the proccess of dumping some serious money into. I will be up to about $2500 by the time I am done. Blew head gasket, bad egr cooler,bad oil cooler. So new head gaskets, egr cooler delete,oil cooler rebuild, turbo recondition ( 4 vanes where stuck in close position), and new vgt solenoid. This truck only has 125k miles on it. No tune bone stock .Like I said 2500 and I am doing it in my driveway. I have read that ford quotes between 4000 and 7000 to do this repair.
The 6.0 is suppose to have more power. My stock 7.3 out runs it everytime. On another note the 6.0 drives like a luxary car compared to my 7.3.
So if you get the 6.0 plan on doing the upgrades I mentioned. Better to do it before you blow the head gasket.
Before you buy the 6.0 pull the egr valve if they will let you. It is right behind the intake elbow. If it appear to be moist or is completely blocked you are probaly looking at the beginning of egr cooler failed.
From what I understand once I finish the work I am doing I will have a."bullet proof " 6.0. But like I said I take the 7.3 over the 6.0 anyday simply because it is more reliable.
Good luck to you.
'88 F 250 7.3 IDI
'00 F 350 4x4 7.3 PSD
'05 Excursion 4x4 6.0 PSD