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  1. M

    Help me find a good manual transmission oil

    So the consensus here is that Amsoil Synchromesh is better than Redline MTL?
  2. M

    Help me find a good manual transmission oil

    Nowhere does this say that this oil is a 75W – 80 GL-4. That’s what my car requires.
  3. M

    Help me find a good manual transmission oil

    Which owners manual did you see that in? My 2019 owners manual only listed the Long Life Gear Oil G7
  4. M

    Help me find a good manual transmission oil

    I have a 2019 Mazda3 hatchback with a manual transmission and want to change the transmission gear oil. Want to go with a quality synthetic aftermarket brand like Redline but not sure which weight the oil is because the owners manual only specifies "Mazda Long Life Gear Oil G7."
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