It is perfectally fine to run Rotella synthetic in your bike. Just look on the back of the bottle and make sure there energy seal isn't on the bottle. The seal is a circle. Says something on the top and if it is energy proven then it will say on the bottem of the seal. Make sure it isn't. Or your clutch will start slipping. Past that, i have noticed my bike to run quieter.
I must've talked to that same tech. Thousands of miles on the Wings that have used the Delo for years with good results have proven him wrong.
He told me there is 90ppm of moly in the Delo. My tranny shifts so much better. It was really getting clunky with any other oil i tried. Smooth upshift now, but still clunky downshifting but not as bad as it was. Mine might be a candidate someday for the 4th gear issue, but i feel the Delo has given it new life for a while longer.
Clutch is almost gone on my Suzuki and i am trying the Delo in it to see if the clutch slips easier under power. So far it isn't any worse. I still have to let up on the throttle after up shifting and then hammer back down or it just slips like crazy. Figure it would be a good test since i have to replace the clutch anyhow. I might add some more moly that i have separate and see how much it takes to get it to slip worse.
My clutch is worn because I didn't realize the shifter seal had let go and dripped all the oil onto the floor in my old shed. Injector oil had been leaking out of my tank through the sightglass and fixed that also.
Years ago Shell tech told me to use 15w40 Rotella in it. Couldn't find out how much of what is in that oil, but i used it for many years until now.