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  1. Why are people (you) using Redline's MT-90 when their app guide recommends MTL?

    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!
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