I must say the new GF6 Kendall in my 2020 Tundra is by far the smoothest, no Tundra tick and I feel that little "punch" with slightest throttle tap. I have experimented with Pennzoil Ultra 0W20, Royal Purple 5w20 then these two Amsoil and Kendall)
I do 5w20 for a little thicker 100c cst.
I do 5w20 for a little thicker 100c cst.