Cummins ISX engine oil?

[farmer70]

Just bought a 2016 ISX right at 500,000 miles was wondering what brand of oil to run in it? Should I find out from previous owner what brand they ran and stick with it. I think it has ran synthetic. I’m not into extended oil changes so I’d rather go back to conventional oil. I was considering John Deere plus 50 oil that I’ve ran in farm equipment. It’s a pretty good oil but it is expensive and not common at truck stops. Also I’m putting a on a OPS bypass filter. I’m guessing by my driving habits and truck make I’ll be in the 12,000 Mile oil change category. Can I ask what gearlube Rawze runs in his engine oil. That’s interesting. If I don’t go with the John Deere oil I’d probably go with Rotella. Thanks.