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...