0w20 to 5w30 to 5w20

I live in Georgia as a reference. After using 0w20 since new to 12000 Miles , I decided to use 5w30 to stave off the engine noises. 5w30 significantly reduced typical Tundra valve train noises but the fuel economy took a nose dive. With 0w20 i was getting 15-16mpg in city and 18-19mpg highway which reduced to 13-14mpg city/ 17hwy. Engine works harder to operate in thicker viscosity oil.
I then went to 5w20 and I feel I found the sweet spot. a quieter engine and as good as 0w20 fuel economy numbers. If you don't tow or beat up on your truck, I think 5w20 is the way to go. If you don't care about the fuel economy or operate in demanding environments go with 5w30.

 

Depends on climate as well.

 

I run canola oil because I’m smarter than Toyota, and it smells good

 

Yes, the higher viscosity number is the hot rating.

 

W is for Winter and is the viscosity at start up on a cold winter morning. The second number is the viscosity at operating temperature. Climate is very important.

Is honey “thicker” than apple juice?