I see it is a '13... I think the fluid change is a red herring.
https://www.mazdas247.com/forum/sho...e-Bulletins)&p=6322426&viewfull=1#post6322426
TSB: 05-004/14
MULTI-MODEL - WHINING NOISE FROM AUTOMATIC TRANSAXLE
BULLETIN NOTE
This bulletin supersedes the previous bulletins 05-004/14 issued on 03/05/14 and 03/19/14. The DESCRIPTION has been revised.
APPLICABLE MODEL(S)/VINS
2012-2014 Mazda3 with VINS lower than JM1BM1K73E1144608 (produced before November 11, 2013)
2013-2014 CX-5 with VINS lower than JM3KE2BE3E0415164 (produced before November 11, 2013)
2014 Mazda6 with VINS lower than JM1GJ1U60E1158307 (produced before November 12, 2013)
DESCRIPTION
Some customers may complain of a whining noise from the automatic transaxle when driving at 10 mph and above. The noise:
Depends on the vehicle’s speed only (the more speed, the more noise)
Occurs with all types of driving (acceleration, deceleration, steady speed)
Does not depend on rpm, gear, or ATF temperature
Customers having this concern should have their vehicle repaired using the following repair procedure.
REPAIR PROCEDURE
1. Verify customer concern.
2. Replace the 6AT assembly with a new one according to MS3 online instructions or Workshop Manual section 05-17.
3. Verify repair.
https://www.mazdas247.com/forum/sho...e-Bulletins)&p=6322426&viewfull=1#post6322426
TSB: 05-004/14
MULTI-MODEL - WHINING NOISE FROM AUTOMATIC TRANSAXLE
BULLETIN NOTE
This bulletin supersedes the previous bulletins 05-004/14 issued on 03/05/14 and 03/19/14. The DESCRIPTION has been revised.
APPLICABLE MODEL(S)/VINS
2012-2014 Mazda3 with VINS lower than JM1BM1K73E1144608 (produced before November 11, 2013)
2013-2014 CX-5 with VINS lower than JM3KE2BE3E0415164 (produced before November 11, 2013)
2014 Mazda6 with VINS lower than JM1GJ1U60E1158307 (produced before November 12, 2013)
DESCRIPTION
Some customers may complain of a whining noise from the automatic transaxle when driving at 10 mph and above. The noise:
Depends on the vehicle’s speed only (the more speed, the more noise)
Occurs with all types of driving (acceleration, deceleration, steady speed)
Does not depend on rpm, gear, or ATF temperature
Customers having this concern should have their vehicle repaired using the following repair procedure.
REPAIR PROCEDURE
1. Verify customer concern.
2. Replace the 6AT assembly with a new one according to MS3 online instructions or Workshop Manual section 05-17.
3. Verify repair.