Is there something wrong with 0-20WT oil ? Some manufacturers use it to meet gas mileage claims. My Toyota has 171,000 miles and runs like a spinning top. With this high mileage would I want a heavier WT oil?
I always use heavier especially in Vegas. 0-20 is for them to meet their emissions bull(crap). It’s not good for engines.
Look at the Chevy 6.2 in the Silverados. They moved them to 40 as they were having issues. All the high performance cars use 40.