Engine oil Mobil or OEM Mazda

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.

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.

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.

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.

I like Mobil 1 0w-40, has more zddp than most others.

I’ve been using mobile 1 European blend for over 100k miles, works great.

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 learned mobil 1 is the absolute worst oil to use in Subaru engines, especially ej257. Simply because it is good oil but because of the poor oil cooling the detergents burn in the engines causing premature wear.