I've used Rev-X and it did clear up the slight stiction issue I had.
I use Chevron Delo 5w-40 Full Synthetic (whatever the current "flavor" due to emissions on the shelf at Wally World)
MOTORCRAFT or INTERNATIONAL filters..... NOTHING ELSE!!!!!
Power Service White Bottle in the winter. I have also used the Silver Bottle and have some Howes out in the garage....
My opinion, the best way to keep a 6.0 reliable, the above maintenance stuff, EGR Delete (if you can due to local checks) and DO NOT TURN IT UP!!!! Mine is 100% stock, except the EGR Delete, and the only thing that has been replaced is the water pump. I've had issues with alternators, which in turn killed a FICM (not the FICM's, bad replacement alternators fault) and now at ~172,000 miles, I've had my first injector issue. Everything else that "must be replaced on a 6.0" is still what it came on it when it left Brookville Road (The plant that made all the IH/Ford/Navistar 6.9/7.3IDI. 7.3/6.0/6.4PSD is about 15 miles from my house, I drive by it every day). Turbo, Head Gaskets/Bolts etc. I'm also a "horrible 6.0 owner". I don't have a monitor, or even any extra gauges (yes I do understand the benefit of them). I just do the maintenance when it's due, with good quality stuff, haven't turned it up, and don't drive it like it a racecar, or used it like it's a locomotive. I treat it well, and it does so in return. We are a Ford Family, have always been, and will always be. My latest Daily Driver is an 11 F-150. I would buy another 6.0 without a doubt, but I also understand at this point and the age they are, that something could go wrong. I was lucky that my Excursion, was owned by an older couple, and all the maintenance was done to the letter (I have the documentation), and it has always been stock...
Sorry for the long post, but someone just getting into a 6.0 from the older engines does need good information. I've had mine going on 12 years......