Only Shell. Will do Mobil if there's no Shell nearby.
On my old daily driver E90, I wasn't as picky but probably did Shell/Mobil 80% of the time.
2009 BMW M3 E92 6M AW/FR
Eibach Springs + H&R Front Sway + LUX AE + LCI Taillights + BMW Performance CF Spoiler + Bastuck Clubsport Exhaust