Engine oil Mobil or PENNZOIL

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.

i use pennzoil plat every 3k seems to be fine for the past 57k miles

I go every 5k using Pennzoil Platinum 5w-30, though it's just a stock engine/tune and more than half are highway miles

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.

The engine itself runs great with the 48K I put on it in the past 2.5 years with biannual oil changes (Pennzoil Ultra Platinum). Averaging 27 MPGs on 91 Octane hwy miles, 24-25 mpg in the city.

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.

I would trust a 0W-20 in a Toyota or Honda. After all, Honda and Idemitsu invented 0W-20, while Toyota worked with Idemitsu on 0W-8. I’ll reluctantly use it in a Subaru(and it must be Mobil 1 ESP X2 or Castrol Edge gold bottle with Mercedes/BMW/VW and/or GM dexosD/dexos2 approvals) but switch over to a ILSAC or Euro 5W-30 once warranty is up.

Pretty pricy imo, used it once then when I consulted with friends/a family member I’ve decided to switch to Mobile 5W-40, as this helps with the temps in my area living in a desert lol.

BMW switched from Castrol to Penzoil years ago...but both cause oil starvation in The S65 motor