After quite a bit of reading, I discovered that not even all dealers use the correct LR specific Castrol oil! I still have warranty for some time, so I wanted to original oil, and couldn't go to my local dealer as they didn't have it. Had to call the next dealer over.
I'll change it every 5-6k, so the little added price isn't a big deal IMO. Worst case scenario $40 extra per change, and i might do it 5 times during my ownership, so $200 for a piece of mind is OK.