Mobil 1 ONLY!
I've been (now retired) a 45-50,000 mile/year commuter for my entire 35+ year career and have owned several brands and models of cars during that time. With one vehicle, a Toyota Echo (standard trans/ no A.C., manual windows-VERY basic 'commuter car'; going for the MPG's), I put 450,000 miles on it! At the time of junking, it had original everything (except consumables-tires, batteries, etc.) including the timing belt! and I had used NOTHING but Mobil 1 in it. Its' 1st oil change was at 100 miles.
I junked this car because of 'road rot' (rust) but would've driven to California and back to Wisconsin without hesitation or fear of mechanical breakdown. In short, Mobil 1 is by far the best synthetic motor oil that money can buy....and I've tried them all, including Amzoil.
For our retirement, we now own a Chev Trax and LOVE it, and are again using Mobil 1 on the same Fall/Spring (alternating oil 'weights' according to cold Fall/Winter (5W-30)/hot Spring/Summer (10W-40) air temps) schedule, regardless of miles. This time, I'm going for longevity/long life. I know this 'spunky' 4cyl. will hold up with the Mobil 1; we'll see about the body with road rot.