I asked BMW in Germany,
what oil is recommended by the motorcycle manufacturer.
I received the following response:
oil recommendations were sometimes updated / extended.
In general please use an oil according to the owner’s manual!
Important here: a few weeks ago we also released the 15W-50 (“BMW High Performance Oil”) for the 800cm-ROTAX-2-Cylinders.
BMW has not released fully synthetic oils for the 800cm-ROTAX-2-Cylinders!
F800 GS- 30 years GS