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...
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!