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  1. Which Manual Trans Fluid for Skyactiv? 75w90 or others?

    2010-2013 Mazda 3 Engine and Performance
    I've been wanting to change the transmission fluid on my 2012 Mazda 3 Skyactiv MT as I've read that the higher quality fluid makes shifting much more smoother. However, while the owners manual says to use 75w80 GL-4 fluid, I can only find 75w90, 75W-85, or 70W-80 fluids. My question is, are...