Premium Synthetic Multigrade High Mileage Passenger Car Motor Oils (PCMO) are formulated to provide outstanding engine protection for engines over 60,000 miles. They are blended from synthetic base stocks and compounded with additive chemistry to deliver superior deterrence against wear and corrosion, restrict oxidative thickening and inhibit promotion of engine acids, sludge and varnish deposits. These series of multigrade oils may be used over an extreme temperature range to permit easier cold weather starting and help minimize engine friction at start-up. They also provide added protection at higher than normal engine operating temperatures. These products contain a seal swell conditioner to aid in the prevention of oil leakage and the multi-grade feature assures performance over a wide temperature range.