Mazda says no to this statement in a TSB is says: ATF M-V (Type M5) has a greater anti-judder specification than Mercon V and Mercon LV ATF.
shameless copied from another site FYI:
Subject:
CORRECT APPLICATIONS FOR ATF M-V (TYPE M5) AND MERCONV AUTOMATIC
TRANSMISSION FLUIDS
Bulletin No: 05-005/08
Last Issued: 4/11/2008
Service Bulletin Mazda North American Operations
Irvine, CA 92618-2922
MULTI MODEL - CORRECT APPLICATIONS FOR ATF M-V (TYP
DESCRIPTION
Always be sure to use the correct automatic transmission fluid when replacing ATF. Using the wrong ATF may
cause shift quality complaints or may even damage the transmission.
NOTE:
ATF M-V (TYPE M5) IS NOT THE SAME FLUID AS MERCONV ATF.
ATF M-V (TYPE M5) HAS A GREATER VISCOSITY THAN MERCONV ATF IN LOW TEMPERATURES.
ATF M-V (TYPE M5) HAS A GREATER ANTI-JUDDER SPECIFICATION THAN MERCONV ATF.
CAUTION:
USING ATF OTHER THAN ATF M-V (TYPE M5) IN AUTOMATIC TRANSMISSIONS
DESIGNED TO USE ATF M-V (TYPE M5) MAY CAUSE SHIFT QUALITY COMPLAINTS.
USING ATF OTHER THAN MERCONV IN AUTOMATIC TRANSMISSIONS DESIGNED TO
USE MERCONV MAY CAUSE TRANSMISSION DAMAGE.