Engine oil Mobil or Shell

I personally use Mobil1 exclusively with 5-30 regularly and sometimes go a bit heavier in the summer or if I'm planning on operating in 'Severe Service' conditions

Had my oil tested and it was recommended for 3500. I went with 3k as I do a lot of miles and use mobil 1 so my cost is relatively low.

All three I ran Rotella T6 5w-40. I ran 5K oil changes with OEM or WIX filters. All had Blackstone oil analysis done, and all passed every time with flying colors.

Mobil1 every 6k like my owner’s manual says. Mine is stock. Blackstone says my oil would be able to go longer if I wanted.

2016 stock WRX here. 6k OCI's using Subaru filters and Mobil 1 5w-30 EP oil backed up by oil analysis. 90k miles presently.

5k with Rotella T6.

20 years driving modified STIs with zero issues.

After some digging through some bimmer forums i saw people say viscosity is less of a factor than ensuring it's LL compatible. So the closest visosity i found in store was 5w-30 and i chose mobil 1 euro spec that was Ll-01 compatible.

I put Mobil1 high mileage full synthetic 5w-30 in both my car and my wife’s. The same gets put in the snowblower and lawn mower. It’s been that way for years and they both cut the grass and throw the snow from -30F to 100F weather just fine.

Im using Mobil 1 ESP 0w-30 which is a thicker Euro oil here in Upper Midwest USA. I don't notice any difference is sound, acceleration, not efficiency vs 0w-16 and 9w-20 in a 2024 Rav4 Prime XSE.

I only really noticed issues with oil consumption when I use mobil1, so I try to avoid that.