Engine oil Mobil or Castrol

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.

Castrol mangnetec gave me good performance but in city conditions it gave inconsistent fuel economies for me and under normal cruising speed 80-90 it performed really good. But for me it felt like reaching higher speeds above 100 felt slower compared to shell. Initial pick up of my car felt higher with this oil.

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 have a 2012 civic with 220k miles still use Castrol 0w-20. I've been using it since 500 miles switched to the high mileage stuff around 100k

Castrol Edge is usually cheaper than Mobil 1 and will be as good.

Can use 5w30 or 5w40.

0w40 or 5w40 will give you slightly better engine protection if you drive at high rpms more often.

I wouldn't use anything cheaper or different than those two really. You don't need more expensive oils than those either.

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.

Mechanic put in mobil1 FS 0w-40. Car went into limp mode exactly at end of trip. engine was running rough and would not go above 40mph. Engine light was on. MB dealership denied warranty for an exhaust issue, stating the Mobil 1 oil (mb229.5) did not meet their required specification (mb229.51).