- Apr 14, 2007
Hello, Simple question: is there any reason for me not to use Shell Rotella T6 15-40 in my 2020 Ram 3500 with a Cummins High Output turbo diesel? This truck is our daily driver plus it has to pull our 20k fifth wheel around America. The manual recommends 10w30 oil, with a 15k OCI. Looking for an oil choice that is easy to find anywhere, and T6 is popular and readily available. I intend to go no more than 10k OCI. Thanks for the input!