M1 fs 0w40 has been working well for me. But this oil does lose some of its viscosity after a couple track days.
I buy mobile1 high mileage 20k mile oil and change it every year (less than 5k miles per year on my G coupe)
Mobil1 0W-30 full synthetic. Just did my first 1000-mile oil change a couple hundred miles ago. Been using Mobil1 0W-40 on my 2011 WRX for 220k miles, tracked, autocrossed, and daily driver duty after 160k miles when I had a head gasket failure and I rebuilt the engine.
If it says 5W-30 then the Hella synthetic should be fine. Except you can do all the other checks yourself. If they will use your parts that is ideal, get a Mazda filter and something like Pennzoil Ultra Platinum, Castrol or Mobil1 synthetic if you can get that.
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.
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.
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.
And that mobil 1 stuff is yess ,, ass. I learned the hard way. Its like water tbh.
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