I decided to sacrifice my car (for science) and see how a UOA looks at 10k m.
I’ve always been a fan of Mobil 1, my last Miata was at 265k m before I sold it and still had great compression numbers.
I’m pleasantly surprised on how the FA20 with M1 did. Blackstone Labs even recommends stretching it out to 12k, which I probably won’t do and will go back to changing it every 8k again. It’s just nice to see that the oil is still healthy and doing it’s job beyond 10k m.
