I have just had an Oil service carried out by an Independent.
The Car Z4 2013 2.0 S Drive N20 B20A.
The Oil provided was 0w20 LL17fe.
Should I be concerned as I was expecting the usual 5w30.
You are already getting this discussed in the E85/6 section. I know that's the wrong place, but as you have it well running you'd be better to follow that one maybe?