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  1. 2014-2018 Mazda 3 Skyactiv Engine and Performance
    I changed my oil at 5k, and asked the dealer parts department whether I could use Red Line MTL (searchable on Amazon by typing in "Red Line 50205 MTL 70W80 GL-4 Gear Oil"). I was far from inspired by their confidence levels. The response was not confidently affirmative. Is this a good...
  2. 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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