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  1. 2010-13 Mazdaspeed 3 Engine and Performance
    I'm going to be changing my gear oil and am curious why it seems if someone is using Redline why they are using MT90 (75W-90) over Redline's recommendation to use MTL (70W-80) which would have a closer viscosity to Mazda's spec of 75W-80. Thanks for your input!
  2. 2010-2013 Mazda 3 Engine and Performance
    I have done the search, and did not find any comparison info.... I had a P5, and now I have a Genpu, both manual. In my P5, I changed the transmission fluid (the gear oil) to Redline MT90, and it made a world of difference. In P5, as some of you know for sure, the shifter is connected to a...
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