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Ram 3500 Ctd 2016 28500 miles, Towed 10,000 lb, TT 4700 miles Rear Out OEM probably Valvoline Syntec 75W90 In 4.2 quarts, Valvoline Syntec 75W90 Front out, Probably Valvoline 75W90 In 2.5 Quarts Valvoline Syntec 75W90 Tom 2016 Ram 3500 6.7CTD single rear wheel, 3.43 rears 2015 Open Range TT...

Guys that run the big trucks, run Delo a lot, they are very familiar with it. Tom

I have used RP, Amsoil SS, Right now Valvoline Premium Blue Extreme 5W-40. It makes no difference to me what Cummins Endorses. Use any CJ-4 or CK-4 Oil, Dino or synthetic, you'll be fine as long as you follow the 15,000 or 6 month drainage. if you go longer go synthetic. Tom 2016 Ram 3500 SRW...