After too many hours spent trying to track down alternatives for ATF M-V (Type M5) I figured I would share the results. Especially as many shops don't even understand the difference. I am currently fighting charges for the wrong fluid (Valvoline MaxLife ATF, a low viscosity ATF) a local goodyear put in my car. In my search I actually managed to find a product sheet on the OEM fluid as well as the true replacements for it.
Mazda OEM ATF M-V (Type M5) | $15/Quart
Data Sheet: https://drive.google.com/file/d/19YESrbTWoGo0yc636el4NFP92d9d8Z2-/view?usp=sharing
Beck/Arnley Premium Automatic Transmission Fluid (Type M5 for Mazda Vehicles) | $12.50/Quart
Data Sheet: https://drive.google.com/file/d/1lInmZAeuqkJdFU_xbUoU45ESjiCpcPvN/view?usp=sharing
Mobil 1 Full Synthetic ATF | $10/Quart
Data Sheet: https://drive.google.com/file/d/1amFMhHfkE_eHa91vAmLJxoue7Nm1k-J_/view?usp=sharing
Pennzoil High Mileage Synthetic ATF | $7.50/Quart
Data Sheet: https://drive.google.com/file/d/1uBeN9LIM41TcRh10rQ1EchNiGFlCb6eB/view?usp=sharing
Pennzoil Dex/Merc ATF | $5/Quart
Data Sheet: https://drive.google.com/file/d/1mzg1eJ60coIOez6AD_EF5Kyq_Msr-bBO/view?usp=sharing
Supertech High Mileage ATF | $3.50/Quart
There are no data sheets available for Supertech's High Mileage ATF but after hours on the phone I have confirmed that it is blended by Pennzoil for Walmart and has the same viscosity ratings as their Dex/Merc ATF and High Mileage Synthetic ATF but itself is not full synthetic.
I am currently using the Supertech High Mileage ATF in my 2007 Mazda 3 2.3L and at $15/gal you just can't go wrong. Also I didn't need to add any additives since it is a high mileage blend and has the necessary additives already. When using Mobil 1 or another high viscosity blend I would definitely add LubeGard.