Oil Viscosity

same engine same truck, usa 0-20, europe 5w-30. i can sacrifice less than 1 mile mpg gain for better protection. i will be doing the next change with 5w-30.

 

This is from a manual for Lexus LX600 sold in United Arab Emirates (same engine as our Tundra)

 

pretty much what i mentioned. 0w-20 is recommended for "best fuel economy and good starting in cold weather" the same documents also refers to higher viscosity oils 5w-20, 5w-30, 10w30. all of which are also recommended based on needs such as starting temps and/or driving conditions such as towing.