Maintain Lubrication of Engine An engine has lots of parts, like pistons and valves that are moving at high speed. As these parts move they create heat which wear down your engine without being properly lubricated
Keeps engine parts cool Moving parts create friction which creates heat. Sufficient amounts of clean oil helps reduce friction and thus reducing heat.
Improve Gas Mileage An engine that is poorly lubricated with lead to increased fuel consumption. It is important for your engine to have clean oil which can help improve your gas mileage by 2%. Overtime this can lead to gallons of gas saved.
Maintains the longevity of your vehicle For many people their vehicle will be their second largest investment. Protecting that investment means keeping the oil clean, full and regularly changed.