zMAX protects an engine from the inside out!zMAX, known for years as Lenckite (Linkite™), cleans, penetrates and protects an engine from the inside out, reducing friction and dispersing carbon deposits, in turn improving horsepower and fuel economy while reducing wear and improving emissions. Functional in all engines and mechanical parts, the Linkite formulation (used in zMAX) is the first pure-lubricant to be approved by the FAA (Federal Aviation Administration) for use in piston engine aircraft.Today, the zMAX formula is used in hundreds of thousands of automobiles, trucks, motorcycles, off-highway vehicles and airplanes. It is endorsed by such automotive legends as Carroll Shelby and A.J. Foyt, who testifies that zMAX helped him win the 1999 Indy 500 and the 1998 Indy Racing League championship.