R1200 / Which engine oil do you drive?

Hello everybody, I’d like to know which oil you use in your R1200. I know that BMW Castrol recommends 20W 50. But you don’t get that everywhere, and that’s why my R1200 often ends up with 10W 40. But now there’s a complete oil change and that’s why I want to do it right. What’s good now? Fully synthetic or semi-synthetic or even mineral? A tip would be great. it would be interesting to learn from a few globetrotters what you are using, if any of you are. In some countries you have to take what is available. Thanks PS: I have already used the search function. Couldn’t find the right topic under “oil” now.