For two decades, we have seen a new API oil classification for on-highway heavy duty diesels every few years. Oil formulations had to change to meet the demands of diesel engines facing ...

-Engine Oil Function The oil that circulates through an engine plays an important part in engine life. Not only does it lubricate the fast moving parts of the engine to reduce friction and wear, but ...

When choosing between two different types of motor oil for your car, it is helpful to understand these oil classifications. They conform to the Society of Automotive Engineers multigrading system, ...

Changing your own oil, while simple in principle, is often a rather deceptively nuanced task in one key area: selecting which oil is best for your vehicle. For instance, there's a huge variety of ...