I might be the longest Liqui Moly user on this board. No affiliations, but since I'm originally form Europe I prefer Liqui Moly for their quality products and putting money into developing good product instead flashy commercials.
I've used this one for 10+ years on my 5's:
LIQUI MOLY - Motor Oils, Additives, Car Care - Products - Synthoil Premium 5W-40
I've also just put this one in my X5:
LIQUI MOLY - Motor Oils, Additives, Car Care - Products - Longtime High Tech 5W-30
But since it's LL04 (depletes faster with US gasoline), for next oil change, I'll use this one in X5 since it's LL01:
LIQUI MOLY - Motor Oils, Additives, Car Care - Products - Leichtlauf High Tech 5W-40
Any of this can be had for $35 for 5L jug which is pretty competitive price.