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FROM GOOGLE
For your Ram diesel (Cummins 6.7L engine), use a manufacturer-approved oil, such as API CK-4/CJ-4 certified oil, with a 5W-40 or 10W-30 viscosity depending on your climate, or a 15W-40 for heavy towing. Valvoline Premium Blue is a Cummins-endorsed option, but other quality brands...
I had the opportunity to see the Antonov an-225 at Person Airport here in Toronto in 2021, what a monster. Too bad it was destroyed by the Russians last year