Oil for 2010 GS

Hi Guys

I am the proud owner of a 2010 GS

I am a fan of semi-synthetic or part synthetic oils.

I owned a 1150 RT on which I only used that.

Currently I am running Castrol Part Synthetic oil in my GS.

Would you guys agree or is there maybe a better oil that accommodates better with the GS engine?

I use either the Mobile one 10/40 or the Castrol GTX 10/40

Using this since BMW no longer makes 10w-40 mineral

This is also the 10w-40 that Bob's BMW is recommending

And you can get a 4 liter jug from Revzilla for less than less than $27 shipped free!