Started reading up on the 6.0 on here and other sites long before I joined, and bought my 2004 Excursion 4x4 Limited 6.0 (first diesel I've ever owned) last November with 115,000 miles, one owner, garage kept and meticulously maintained for a smoking deal. What I learned here definitely helped me, I knew what to look for and what to avoid.
This ended up saving me several thousand on the price of the Excursion as the Dealer just wanted one of these terrible 6.0 diesels off his lot apparently, and never took the time to go through all the receipts and records that were in the glovebox.
Previous owner had done head gaskets and ARP studs at 105,000 along with EGR delete, new hpop, new oil cooler, switched to CAT ELC coolant, installed Fumoto valves in block and oil pan, upgraded oil lines to turbo, coolant filter, etc, etc.......
Cliff notes: Love the Excursion. Glad to be here.