Everything you wanted to know about oil (or don't) is on this site.
https://www.bobistheoilguy.com
They even have a forum - w/ a thread on Dack's favorite German Castrol -
https://www.bobistheoilguy.com/forum...8643/FAQ_-_GC_(_German_Castrol_)#Post718643
And even a thread about why NOT to run the Shell Rotella T6 full synth that I used to run in my Suzuki GSXR-750 racebike. Hint: Shell R-T6 is high in phosphates. Good for engines, bad for catalytic converters. Race bikes (and big diesels) don't have them. Oh and since I changed my oil every 4 trackdays it made sense to buy the cheapest good oil avail.
For the e82 - I run what my Indy uses. Castrol. Same as Dack.