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Can't say what it does in the FA motor, but having done 10,000 oil changes in the past 12+ years working on subies, done countless oil analysis and tracked lots of customers oil consumption issues. We found that the M1 does not work well in the EJ motors. Clients generally consume more of it, then switch to a higher quality oil like Motul or Amsoil and the consumption dissipates. Also most of the "eco" oils out there tend to break down quicker under higher heat than the more robust non-eco ones. Such as the Motul X series v. the ECO series.
-mike
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