Mobil1 extended performance (high mileage) advanced full synthetic motor oil 0w20 is an advanced synthetic designd to keep your engines running like new and protect critical parts for 15,000 miles between oil changes. mobil1 extended performance features a special formulation that helps to provides outstanding performance protection during oil change intervals.mobil1 extended performance is made with proprietary blend of high performance synthetic basestock fortified with a precisely balanced additives component system, designed espercialy to help deliver performance and protection during oil intervals, provide outstanding levels of performance, cleaning power and engine protection. *helps to prevent deposits*helps to provide outstanding engine protection at all oil change intervals of 15,000 miles or 1year, which comes first.