2023 Toyota Tundra Transmission Fluid & Service Guide

Quick Answer

• Transmission Make/Model: Aisin AC60F (6-speed on 2WD SR/SR5), Aisin AJA6F (6-speed on 4WD SR/SR5), Aisin AF10F (10-speed on all other trims).
• OEM Fluid Spec: Toyota WS (World Standard) Automatic Transmission Fluid.
• Drain & Fill Capacity (Approximate):
  • AC60F/AJA6F (6-speed): 4.0 - 5.0 quarts
  • AF10F (10-speed): 5.0 - 6.0 quarts
• Full Overhaul Capacity (Approximate):
  • AC60F/AJA6F (6-speed): 10.0 - 11.0 quarts
  • AF10F (10-speed): 12.0 - 13.0 quarts
• Filter OEM Part Number: Verify with dealer or service manual as multiple filters may exist for different transmissions.
• Recommended Service Interval: 60,000 to 100,000 miles for normal duty; 30,000 to 60,000 miles for severe duty/towing.

Fluid Type Explained

The 2023 Toyota Tundra, depending on its configuration, utilizes either a 6-speed or 10-speed automatic transmission manufactured by Aisin, a reputable transmission supplier. Regardless of the specific Aisin model (AC60F, AJA6F, or AF10F), Toyota specifies Toyota WS (World Standard) Automatic Transmission Fluid for all of these transmissions. It is crucial to use only genuine Toyota WS fluid or an approved equivalent that explicitly states compliance with the Toyota WS specification.

Toyota WS fluid is a synthetic, long-life fluid designed for optimal performance and protection in modern Toyota transmissions. Using a fluid that does not meet the WS specification can lead to a variety of problems, including premature wear, erratic shifting, reduced fuel economy, and potential transmission failure. This fluid is formulated to maintain its viscosity and lubricating properties across a wide range of operating temperatures, ensuring smooth operation and extending the lifespan of your transmission.

Service Procedure

There are generally two methods for servicing transmission fluid: a drain and fill, and a full fluid exchange (sometimes referred to as a "flush").

Drain and Fill

A drain and fill involves simply draining the fluid from the transmission pan and refilling it with new fluid. This method replaces only a portion of the total transmission fluid, as a significant amount remains in the torque converter, valve body, and cooler lines. While simpler and less expensive, it's often recommended for regular maintenance within the suggested service intervals. Given the approximate drain and fill capacities listed above, you'll replace about half of the total fluid with this method.

Full Fluid Exchange (Flush)

A full fluid exchange, or flush, typically uses specialized equipment to push all of the old fluid out of the transmission system while simultaneously introducing new fluid. This method ensures nearly 100% of the old fluid is replaced with new fluid. While more comprehensive, it's also more costly and should only be performed by experienced technicians using the correct equipment and procedures. For high-mileage transmissions that have not had regular fluid changes, a full fluid exchange can sometimes dislodge deposits, potentially leading to issues. Therefore, it's often advisable to stick to regular drain and fills, or to consult with a trusted mechanic for the best approach based on your vehicle