Easy. The manual says API category SN is REQUIRED and Shell Rotella doesn't meet API SN.I stopped into the dealership where I purchased my Jeep. I asked about the oil they would use with an oil change. They said they would use whatever oil is speced for the engine. I pressed further and asked what brand they would use. The responce was Shell Rotella.
I will contact them and let them know my concerns about this oil not meeting spec.
I do know the Rotella is good stuff. I would love to see a document that advises dealerships not to use it.