For best performance, follow the manufacturer's recommendations in your vehicle owner's manual. Mobil 1 High Mileage 5W-30 advanced full synthetic motor oil is designed to help maximize engine performance and extend the engine life of vehicles with more than 75, 000 miles. Mobil 1 High Mileage oils are made with a proprietary blend of high performance synthetic base stocks fortified with an additive system designed especially for higher mileage vehicles. Mobil 1 High Mileage motor oils are recommended for vehicles with more than 75, 000 miles including all types of modern gasoline engines found in passenger cars, SUVs, light vans and trucks. Mobil 1 High Mileage motor oils are suitable for many types of severe driving applications including high-speed highway and stop-and-go city driving. It is not recommended for two-cycle or aviation engines, unless specifically approved by the manufacturer. Motor oil is made from crude oil and is used to lubricate, clean, and cool engines. Types of motor oil include conventional, synthetic, diesel, bio-based, hybrid (blends of conventional and synthetic), and recycled oils. Motor oil varies in weight and viscosity, as well as additives that some manufacturers add to the oil during the refining process. A numerical code system created by the Society of Automotive Engineers (SAE) grades motor oils according to viscosity--the higher the number between 0 and 60, the more viscous (thicker) the oil is. Most consumer motor oils are graded by two numbers, with the first number indicating cold weather (Winter or "W") performance.SAE 5W-30 This oil has a weight of SAE 5W-30, meaning it has an SAE viscosity rating of 5 in cold temperatures and a rating of 30 at normal operating temperature. Always check your vehicle's owner's manual to verify that this is the correct weight of motor oil for your vehicle.Full Synthetic Oil This oil is a full synthetic oil, meaning crude oil is not used in making it. Synthetic oil can be used in vehicle engines instead of motor oils refined from crude oil, and often provides superior mechanical performance over traditional motor oil, including increased gas mileage and reduced engine wear at extreme temperatures. Its complex method of production means it can often cost more than conventional motor oil.