The highest grade of lubricants are known as esters. These lubricants are fully synthetic and provide unequalled lubricity that bonds with metal engine components to create a shield against wear. Designed to deliver the best possible performance for all four-stroke snowmobiles. It provides easy starts at extremely low temperatures, fast flow on startup, and a high level of corrosion protection and water shedding capabilities. Resists thermal breakdown, under extremely high rpm and load conditions providing high performance and durability even while racing.