2013 Mazda 6:
Out: Mazda MV ATF factory fill
In: Royal Purple MAX ATF
Siphoned the small fluid reservoir and replaced with new. Drive a bit. Do it again. Did it last year for 2 quarts at 60,000 miles. Did it this year for 1 quart at 75,000 miles.
2015 Mazda 5
Out: Mazda MV ATF factory fill
In: Mazda MV ATF
At 60,000 miles last year, I had the dealership do a full servicing as the price was reasonable compared to the enormous mess I would have caused trying to do this myself. This Mazda 5 doesn't have a readily-accessible main fluid reservoir and requires disconnecting hoses to do a useful job, so, it is more than a simple DIY.