After reading all the oil threads regarding the 2020 ecodiesel I was under the impression that Shell Rotella T6 was NOT approved for the 3rd. generation ecodiesel, and that the factory recommendation was to use Pennzoil Ultra Euro 5w-40, or any of the other brands that have been previously mentioned as acceptable. So after having the dealer change my oil at 10k, I noticed that they put in Rotella T6. The service manager swore that this was the correct oil and that that was all that the factory sends the dealerships. I subsequently called 3 other local dealers and they all stated that that was indeed the oil that is now used.. Has Shell changed the formula or has something else happened that I was not aware of in regard to Rotella T6?