Quote Originally Posted by cumminsdieselfreak View Post
5w-40 without question IMO.


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What is the benefit of running 5w40 over 10w30? I’m just wondering because I’m about to change the oil for the first time in my 5th gen. I live in south louisiana so it never gets below 0F and the truck is still emission compliant.

For my 13 cummins I ran Valvoline with a 14k miles interval for years and had blackstone monitoring it for me. Everything stayed good. But this truck makes me second guess things.