Rotella is an "all-fleet" oil. Rimula is not. Rimula (I'm talking in the USA here) is a heavy diesel oil. It has only much older gasoline ratings.
Just as there is a compromise between (for example) detergents and lubrication in an oil, so too is there a compromise between gasoline and diesel engine needs.
You'll find that in heavier industry (agriculture, mining, lots of stuff) folks don't use "all-fleet" oils as much. They use heavy diesel oils. I'm not knowledgeable enough to talk about specific differences, but you'll find that most or all the major oil companies have a separate heavy diesel oil line.
Those of us who were running farms for example used heavy diesel engine oils in our tractors unless somebody had lots of diesel pickups and didn't feel like having 2 drums or totes in the shed.