Another M1 user here, 10w30 and when I traded in my 09 with 107k miles it never used a bit of oil between 4k changes. And I heat the ghost out of that car. I think it's luck of the draw, regardless of oil brand or even variations in viscosity. Mass produced or hand built every engine is different in it's own microscopic way. Just keep up with checking it and don't worry about it. Now my girlfriend's 05 DE, that's another story lol...
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