I doubt you found 5w-20 Diesel oil meeting Chrysler Material Standard MS-6395. Use at your own risk.

The 2011 3.7 L V6 engine, or 3.6 in the RAM 1500 takes 5 quarts (6 quarts 3.6) of 5W-20 oil and uses the Mopar 05184231AB oil engine filter or the 3.6 uses cartridge filter.