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For the 2011 Mazda CX-9, the recommended transmission fluid is Mazda Genuine JWS3309. However, you can also use alternatives like Valvoline Full Synthetic Transmission Fluid Multi-Vehicle or Beck/Arnley Synthetic Automatic Transmission Fluid T-IV. The transmission fluid capacity for this model is 7 US quarts, which is useful information if you are doing a complete fluid replacement. Generally, transmission fluid in this vehicle can last up to 100,000 miles before needing a change, but it's a good idea to inspect the fluid level weekly and add more if it gets low.
The 2011 Mazda CX-9 requires ATF Type T-IV fluid for its automatic transmission.