New Truck - X15 Advice

[03maxpower]

I went 30000 on my first oil change and Schaeffer’s said it’s good I didn’t go any longer with the delo oil. I changed at 30000 with Schaeffer’s oil and oil was good but additives were depleted. About to change at 30000 again and see what I get. Rawze is right about 50000 for the mega carriers Cummins themselves told me that. Not good to buy a fleet truck.