From talking to several reps at work for fuel system additives, essentially every single one of them are exactly the same, except for how diluted they are. They’re all the same chemical blend. Pick which bottle you like and it’ll be fine.
As far as oils go, motorcraft 10w30 or 5w40 only. It says directly on the oil fill cap “CJ-4 oils only”. Ford has a TSB stating that ck4 oils do not meet the requirements of the 6.7 powerstroke. It’s difficult to find cj4 oils these days, so using the oil that ford has designed is an extremely safe bet. Since, well, they designed it for their engines.
Ford says that ck4 oils cause extreme rocker arm wear and I’ve personally seen it on numerous occasions. I’ve also personally seen T6 cause issues in 6.0s. Drain the oil, put motorcraft oils in the engine, issue stops. I’m sure you’ll find plenty of people to tell you I’m wrong and t6 is gods gift to earth, and power service is way better than X brand.
06 King Ranch
Fass 200, Custom fuel lines, 225/100s, Thumper stage 2 hpop, WPE stage 3 intake, Mishimoto radiator, Flex a lite fans, BPD water pump, MPD oil cooler relocate kit, Intercooler pipes, Compounds built by me, etc etc etc
05 Eddie Bauer
Resealed entire motor @ 170k miles, new lifters, 6.4 push rods, studs, rebuilt the turbo, IPR egr delete, new injectors, new heads, new ficm board, coolant filter, intercooler tubes, regulated return, bunch of other new parts. Factory exhaust, cat gutted(wife's rig). Livewire with gearhead tunes. Should go a while reliably for her!
03 LB7 duramax the "daily/tow pig"
Lbz cp3, s475/stock twin kit, built trans, steel driveshft, amsoil bypass, secondary oil cooler built by me, fass, traction bars, trans cooler upgrade, dual alts, straight center link + tie rod sleeves, efi live, transfer flow/tool box tank, 5er hitch, other small upgrades.. and most importantly, STOCK HEADBOLTS! Just rolled 200k miles, twins installed @ 165k, daily driven on a "550 tune" tows 18k on a "475" tune.