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.
My N54 hated any variant of Mobil1 sad to say. When I had American vehicles they all seemed to love it however. Currently running Motul 300V on a FBO, occasional E85 mixed N54 and wish I used it from day one.
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
2016- 130k miles and counting. Stage 1+ tune (Bren tuning). Clutch @ 90k. AOS is great. Motul oil every 4K miles- get the fumoto oil drain valve to make it easy.
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.
I do Motul @ 5k.
I’m at 133k with no weird noises, knocks, etc.
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.
MOBIL 1 every 5k miles. Not the worst or the best oill
And that mobil 1 stuff is yess ,, ass. I learned the hard way. Its like water tbh.
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