A16 is differential not transmission.
(A) ● Replace engine oil
(1) ● Rotate tires
(6) ● Replace rear differential fluid Independent of the maintenance messages in the multi-information display, replace the brake fluid every 3 years. Inspect idle speed every 160,000 miles (256,000 km). Driving in mountainous areas at very low vehicle speeds or trailer towing results in higher level of mechanical (shear) stress to fluid. This requires differential fluid changes more frequently than recommended by the Maintenance Minder. If you regularly drive your vehicle under these conditions, have the differential fluid changed at 7,500 miles (12,000 km), then every 15,000 miles (24,000 km).
Number (2) service code is the one you replace the cabin air filter:
● Replace air cleaner element
● Replace dust and pollen filter If you drive primarily in urban areas that have high concentrations of soot in the air from industry and from diesel-powered vehicles, replace every 15,000 miles (24,000 km).
2011 Acura MDX Tech/Ent (Palladium Metallic/Ebony): OEM Wood Steering Wheel, OEM Wood Shift Knob, Advance Running Boards, OEM Tow Package & Color Matched Body Side Moldings. Mods: Power Steering Filter and LED Interior Lights Awaiting Install: HID Fog Lights
Other Cars (Current): 2008 Lexus IS350 & 2007 Volvo S60R