I thought the factory fill was 10W30 For all trucks 19-22, regardless of model year since not all trucks would not see below 0°F from new, and trucks located in areas where the ambient temperatures routinely fall below 0°F (18° C) during the winter, it is required to use 5W40 synthetic engine oil.
Not trying to argue, I just thought the factory fill was 10W30 but I also wanted to get the break in oil out as well.
I thought that's why they came out with service bulletin 09-011-20.
TSB 09-011-20 was issued becuase owners AND dealers were using 15W40 that was allowed in the pre-CGI engines.
It's my understanding the factory fill is 5W40 because they don't know where/when those engines will be sold and put into service.