AMSOIL extended-drain synthetic motor oils deliver peace of mind by providing all-around protection that allows you to go longer periods between scheduled oil changes if you so choose (we all have busy lives). This makes it even easier schedule routine maintenance of your vehicle, for instance, for those drivers who desire to follow the oil-change frequency outlined in their vehicle manual. For many of us, we want the assurance that our engines are well protected in the event that we delay in taking in the car for routine maintenance.