The 2019 Toyota Tacoma uses two different transmissions depending on the trim: a 6-speed automatic and a 6-speed manual. Each one calls for a distinct fluid: Toyota ATF WS for the automatic and Toyota’s manual transmission fluid (MTF) or a GL-4 gear oil for the manual.
Understanding the transmission options in the 2019 Tacoma
To determine the correct fluid, identify which transmission your truck has. The automatic trans is common on most trims, while the 6-speed manual is found on certain configurations and trims. Using the correct fluid is essential for smooth shifting and long-term reliability.
Automatic transmission (6-speed)
For the automatic 6-speed transmission in the 2019 Tacoma, Toyota specifies ATF WS (World Standard). Use Toyota Genuine ATF WS or an equivalent fluid that explicitly meets the WS specification. Do not substitute Dexron-based or other non-WS fluids unless Toyota approves it for your exact model and year.
- Recommended fluid: Toyota Genuine ATF WS (World Standard)
- Alternatives: Any ATF that meets Toyota ATF WS specification
- Important note: Avoid fluids not specified for WS, as using the wrong type can affect shifting and transmission life
In short, automatic-equipped Tacomas require ATF WS to maintain proper operation and reliability.
Manual transmission (6-speed)
For the manual 6-speed transmission, Toyota’s guidance is to use Toyota Genuine Manual Transmission Fluid (MTF) or a GL-4 rated gear oil, typically in the 75W-85 range. Many owners use MT Fluid or a GL-4 75W-85, and some compatible GL-4 oils in this viscosity range can meet the spec. Avoid GL-5 fluids, engine oils, or fluids not rated GL-4 for this transmission.
- Recommended fluid: Toyota Genuine MT Fluid (T-MTF) or GL-4 75W-85 gear oil
- Alternatives: Any GL-4 75W-85 gear oil that meets the GL-4 spec
- Important note: Do not use GL-5 or fluids not specified as GL-4 for the 6MT
In short, the manual-transmission Tacoma uses MT Fluid or a GL-4 75W-85 gear oil.
Practical tips and cautions
Always verify the exact specification for your vehicle using the owner's manual or by checking the VIN/vehicle details with a Toyota dealer or service manual. Fluid capacity and service intervals vary by transmission type and vehicle configuration, so refer to the official documentation for your specific truck.
Summary
For the 2019 Toyota Tacoma, use ATF WS for the 6-speed automatic transmission and MT Fluid (or GL-4 75W-85 gear oil) for the 6-speed manual transmission. Confirm the exact specification with your owner's manual or a Toyota dealer to ensure compatibility for your particular truck.