FHS SmokeLess Oil is a unique synthetic oil that was developed from high performance racing oils. These special oils were necessary for engines to survive the extreme conditions encountered in racing. By using the same innovative, cutting-edge technology, FHS has created a new oil to prevent the problems that occur in worn engines. Several special properties allow this oil to work for you. SmokeLess is recommended for a standard used car or high mileage car with a worn engine that smokes heavily. SmokeLess Lite is recommended for reduced smoking problems and valve/lifter noise due to colder climate or cars that require a thinner oil. FHS SmokeLess Oil is a superior quality, extreme-high-temperature, ultra-pure synthetic oil which has a flashpoint much greater than 500 F and contains none of the volatile impurities of other types of oil. This means that SmokeLess Oil will not burn or smoke in an engine like conventional motor oils. The oil stays cleaner, drastically reducing emissions and greatly extending the mileage available between oil changes. It is clear in appearance, but slowly picks up a slight color from use in an engine. FHS SmokeLess Oil has a special sealing/anti-wear agent that covers cracks and prevents wear better than other types of oil. This sealing/anti-wear agent was originally designed for racing engines, and therefore gives incredible protection without thickening, gumming, or slowing the engine like other products. Racers on the ragged edge need the fastest oil with the best protection. This same anti-wear agent greatly extends the mileage possible on the same oil change. The oil can easily go 6000+ miles per change Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.