At one time, I used Rotella T6 in my '08 V. I switched to Mobil 1 for motorcycles a few years ago.
Look at the Q & A of the Rotella link above - it says that the amount of sulfur in this oil will clog "modern" catalytic converters used for gasoline engines, and that T6 is for diesel engine use only (or gasoline engines with out a modern cat converter). [There was no explanation of what "modern" means. ?]
Since we've read it on the interweb, it must be true...
Beside having a high sulfur content, diesel oil doesn't provide the same level of protection, particularly for higher revving gasoline spark ignition engines.
"The poor overall wear protection performance of all but the one particular top ranked Diesel oil, makes it very clear that in general, Diesel oils are a poor choice for wear protection in High Performance gas engines.
When you look at the onset of thermal breakdown of these Diesel oils, you see the following. On average, for synthetic Diesel oils, the onset of thermal breakdown was 269*F, and on average for conventional Diesel oils, it was 255*F. Overall, these Diesel oils fell victim to heat 13-17*F lower than gas engine oils. So, that is even more reason that using Diesel oils in High Performance gas engines, is a poor choice.
High Performance gasoline engines are far better protected against wear by selecting from the much more capable gas engine oils. The only exception is the excellent synthetic 5W30 Amsoil Series 3000 Heavy Duty Diesel Oil, which is also SL rated for gas engines. In the past, I have never recommended using Diesel Oil in a High Performance gas engine. But, this top 10 ranked oil, out of 101 motor oils tested so far, is the only Diesel oil I’ve tested that is actually worth considering for High Performance gas engines, if you just have to run a Diesel oil in your gas engine..."
Test Data on 3 more Diesel Oils ? Surprising results ? Speed Talk