I purchased my 2024 Ram 3500 SRW CCSB Cummins SO a month ago. I have nearly 2500 miles on it right now. I am planning a trip from Denver, over the Rocky Mountains to Grand Junction (eastern plains to western slope) in 2 weeks. I'll be hauling my 12,000lb 5th wheel. I was planning on changing out the motor oil, but my sales guys (he has owned 6 Cummins before) and the parts guy told me I was crazy and I was good to run the "out of the factory" oil in the engine. Hauling a 12,000lb trailer over Loveland and Vail passes are not easy with both being 11,000ft+ above sea level (starting at 5,00ft) with massive incline and decline grades. I'll be putting the engine through it's paces. Thoughts?