There has been a lot of information posted about why the auto manufacturers specify 5W-20 in the first place. I agree with the school of thought that suggests that the car probably gets slightly better gas mileage with 5W20, and therefore is an easy way for the manufacturers to meet their CAFE (Corporate Average Fuel Economy) requirements mandated by the EPA.
And I also agree with you that an oil such as Schaeffer's Supreme 5W-30 is better for your engine. If it were my car, I'd make the switch.
And I also agree with you that an oil such as Schaeffer's Supreme 5W-30 is better for your engine. If it were my car, I'd make the switch.