FWIW
I just switched to Rotella 15W40 "dino" oil. I previously had the OEM blend first and then Rotella T6. I changed from the OEM blend to Rotella T6 at 1,500 miles (early) because that is just what I do. I switched from the Rotella T6 at 3,000 miles due to less-than-ideal shifting. (I am very picky I guess?)
I switched to Rotella 15W40 because I plan to change it every 3,000 miles. Almost any oil (of the proper viscosity) will perform adequately for a small interval like that. Rotella 15W40 is JASO MA2 certified. The biggest issue (for me) with intervals beyond 3,000 miles is (shared sump) shearing. I would use the Rotella T6 but it shifts noticeably rougher with it. The Rotella 15W40 is slicker shifting and it is easier to find neutral. I can get the Rotella 15W40 for under $15 a gallon if I look a little. I will replace the filter every 9,000 miles. (I changed the filter at 1,500.) I will replace the two metal crush washers every 3,000 miles. I will examine the sump plug o-rings with a magnifying glass and if they look fine I will reuse them, but I will replace them every 9,000 miles. I like the smaller viscosity spread of 15W40 than 5W40. I don't mind changing oil. I find it relaxing and I like to work on my stuff. I recycle the oil so I am not hurting the environment. I am not worried about the engine warranty. This is not my first rodeo.
YMMV