Engine oil Mobil or Shell

So I’m in the U.K. and I just had my car serviced it’s an x4M, the reccomend is BMW or Castrol Edge, I went for Mobil 1 0w-30. For some reason not sure if it’s the oil my fuel economy has gone up by 100 miles per tank

Rotella T6 15W-40 in the perfectly sized 2.5 gallon jug. I’ve run this in both LML’s since day 1 and combined it’s over 500,000 miles.

I have 2015 sportwagon tdi and use shell rotella t6 5w 40 . I have 340000 miles on and runs fine.

I’ve been running shell T6 in my STI forever with no issues.

Mobil1 especially the ESP 5W30, it has certifications from major manufacturers such as MB229, BMW LL, and importantly Porsche C30 certified which is the most strict out there... Also can't be helped that I own a Peugeot which happens to recommend Mobil 1 as well...

12 years running and no major issues so far on the unreliable-ass Prince EP6 Engine.

Haven’t been happier since I switched to Rotella 5w-30 synthetic, the motor purrrsss and burns a 1/4 of the oil.

‘15 here and I use Mobil 1 0w40 euro spec or whatever it is.

T6 Rotella 5w-40 when I run test pipes on tune, the heavy weight is great for keeping oil temps down and the zinc is awesome as a friction inhibitor but is terrible for cats so when I’m going to pass emissions I run Kirkland 5w-30 full synth on stock cats.

She burns ~ 1 Quart/5000 Miles.

BTW, Mobil runs hotter in my car.