Quote:
Originally Posted by torqueaddict
As a side note: I'm not touching the fluid in the rear diff unless there's a problem or recommended by the dealer / GM. Same with the manual tranny. My last car had 165K hard miles (mazdaspeed 3) on the original clutch and tranny, and to this day it shifts just as smoothly as day 1. Same fluid.
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If you race the car, or drive hard (canyon/twisty runs) you should change diff fluid periodically. They call for every 24 hours of track time - in my world that ends up being once a year or so.
All fluid breaks down over time, viscosity...your Mazda may shift well, I wonder if it would shift better with fresh fluid? We changed the fluid in my 2014 after about 40,000 miles (installed diff cooler, so we had to)...didn't make a lick of difference.