After researching the procedures on how to change the Transmission Fluid in my 2017 Toyota Tundra, I determined I should have a professional do this for me. I purchased a couple gallons of AMSOIL Signature Series fuel efficient automatic transmission fluid. I then took the vehicle to Lemon Grove Transmission located at 3483 Grove St, Lemon Grove, CA 91945. They have been in business for over 67 years. When I called to see if they would do it, they warned me about not using the Toyota WS Fluid. I know this place actually had experience after he mentioned that the Toyota Dealers wont change fluid on most of their Transmissions because they think they designed transmissions that never need a fluid change. (impossible). I let them know that the AMSOIL Transmission fluid I used met the Toyota WS Specs and AMSOIL actually had a warranty. After getting the transmission fluid change I swear the truck shifts a lot smoother. I read to many articles and it really seems the Toyota WS Transmission fluid is not all that great.