The reference guides state that a drain and refill can take between 3.7 to 5 qt.
http://mazda3revolution.com/forums/2010-...uid-change.html
There is a dipstick, but it must be accessed by removing the intake.
You just need to use the dealer fluid and make sure the transmission is at least warm (122F +) before checking the fluid level.
From Bulletin No: 05-003/13
Quote:
BULLETIN NOTE
• This bulletin supersedes the previous bulletin 05-007/11 issued on 09/21/11. The APPLICABLE MODEL(S)/ VINS have been revised.
• Changes are noted below in Red beside the change bar.
APPLICABLE MODEL(S)/VINS
2012-2013 Mazda3 2013-2014 CX-5 2014 Mazda6
DESCRIPTION
The new SKYACTIV-DRIVE FW6A-EL AT uses “Automatic Transmission Fluid (ATF) Type: FZ”. Only use “ATF-FZ” to fill or top off the fluid level. ATF-FZ is specially designed for use in the SKYACTIV-DRIVE series AT. It is a low viscosity formula with less friction for better fuel economy.
NOTE: ATF-FZ is colored blue for easy identification.
To check the fluid level, remove the bolt, then remove the dipstick. The dipstick is marked with a “FZ” on SKY-
ACTIV-DRIVE FW6A-EL AT. When finished, insert the dipstick and install the bolt.
Tightening torque: 8-10 N·m (82-101 kgf·cm, 71-88 in·lbf)
The fluid level should be between the “L” and the “F” when the ATF is warm (at least 50 °C (122 °F)).
SKYACTIV-DRIVE FW6A-EL AT with “ATF-FZ” is "filled for life" (no change intervals for ATF required) and flushing is not recommended as part of service maintenance. There are no oil cooler lines and the replacement SKYACTIV-DRIVE FW6A-EL AT will come with a new oil cooler, which is mounted directly to the case. If repair or AT replacement is necessary, use only “ATF-FZ” to fill the AT.
CAUTION:
• ATF-FZ is designed ONLY FOR SKYACTIV-DRIVE series AT.
• If an ATF other than “ATF-FZ” is used in the SKYACTIV-DRIVE AT, the performance and reli- ability cannot be guaranteed. The resulting damage will not be covered by warranty.
• Use of ATF-FZ in non SKYACTIV-DRIVE ATs may result in serious internal damage that will not be covered by warranty