Tag: redline mt-90


Mazda3 Manual Transmission Fluid Change

4 fresh quarts of MT-90.

Time for another installment of Mazda3 maintenance! This time it’s the manual transmission fluid and the differential fluid. They are one in the same. Mazda calls this a “lifetime fluid” and never calls for it to be changed out. In my humble opinion, that’s not good. Nor is it right. So here’s how you change it.

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