I use original Mazda oil and Nipparts for the filters. I live in Europe and I buy these for 80€ / 85$.
Valvoline VR1 has zinc and they make a 20w50 for "race" application.
I use valvoline 5w-30 full synthetic in my g35. Runs great
Valvoline 20w-50 works great
I use Valvoline Extended Protection, it's really good stuff
For [Naturally-Aspirated Skyactiv engines](https://en.wikipedia.org/wiki/SkyActiv), it is highly recommended that you use Mazda's own(Idemitsu) high molly GF-5 0w-20. [Arguably it is one of the best oil for skyactiv engines]
Valvoline VR1 for the track car. Valvoline VR-1 is a very highly reviewed oil with a high zinc content to keep race engines running with very minimal wear.
I believe the final takeaway was that Valvoline Max protection was the best
I just switched to Valvoline EP 0w20 after using Mobile 1 all my life, for a very important reason...
...the easy to open top with a built in pour spout. So good.
For this reason I run Valvoline 20W-50 VR1 which has high zinc and phosphorus to deal with the extra loads the flat-tappets put on the camshaft vs roller tappets.
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