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  1. M

    NA Miata - MT and RD fluid

    Use a GL4 for the transmission, I always used Redline MTL for the two NAs (1993 and 1996) I had. It helped with engaging second gear when cold. Don't forget to fill the turret. For the differential, Redline 75w90.
  2. M

    Best 5w-30 oil for 2025 Mazda CX5 Turbo while under warranty?

    I have a 2020 CX-9 with 107,000 miles on it, same engine. I have used Castrol EDGE Extended Performance 5w-30 with a 7317-size filter since new.
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