I have no dog in this fight, but the manufacturer of Dodge pickups, now called Ram, uses a bidding system for their Lubricants
Companies that make lubricants must submit their lubricant for testing, i forget what the timing of that testing is. 6 months, 1 year, or whatever
The testing has to be done & run by whatever the name of the auto manufacturer is, ie: Dodge, Chrysler, FCA, & now Stellantis, etc.
All testing has to be paid for by the Lubricant Manufacturer, ie: Mobile, Valvoline, Texaco, Shell
If the lubrication company is not willing to pay for all the testing for Certification, that brand will not be considered to win the Lubrication Contract for the period of 1 year.
Right now, Shell has been the only company that is willing to pay for the Testing & Certification
All of the rest of the lubrication manufacturers have decided that they can sell their brands for a large enough profit, that they don't need FCA or Stellantis to certify their oil & possibly lose money if they lost the bid for the lubrication Contract
.......
In 2007 - 2010 Mobile Oil had the Contract
In 2011 & 2012 Vavoline had the Contract
Shell Oil is the current Contract holder & no one else submits a product
Therefore you can never know if Shell is the best brand for your Ram trucks
