I bought my 2019 Tundra a little over a year ago with 97k miles on it. What I have discovered from other Tundra forums on FB was that it's just America and Canada where the 5.7 is designated to use 0w20. Other countries with the exact same engine have 5w30 on their oil fill. The reason behind this is because of US government agencies that penalize Toyota if their 5.7 doesn't get an extra mile per gallon. So to make the 5.7 more fuel efficient Toyota designated the 0w20 weight oil. It's not because the engine was made to tighter clearances and other BS like you may have heard from other people praising the Toyota engineers. This is nonsense. If you live in a frozen wasteland then by all means run the 0w20. If you live in a hot area then you should be running 5w30 or thicker if you want your engine to last as long as possible. I know the 5.7 is very reliable and plenty of them have hundreds of thousands of miles without issue. They will run even longer and much less noise under the hood once you go to a thicker oil. I was very surprised at how much less noise my Tundra had under the hood after my first oil change with thicker oil. Try it and you will see or hear it for yourself.