Motor oil comes in a variety of forms, designated by pairs of numbers, but the most common two are 10W-30 and 10W-40. What's ...

Formulated with advanced additives for year-round engine protection is Valvoline's Premium Conventional Motor Oil. The company's lineup of motor oils is available in multiple viscosities: 10W-30 ...

Typically, moving from a 10w40 engine oil to a 5w30 would show a fuel economy improvement of around one to two percent.” Modern engines are designed with tighter tolerances and boast thinner ...