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This product contains high levels of zinc-thiophosphates, in combination with Champions proprietary TVS (Thermal Viscosity Stabilizer), which extends oil film capacity for proper ring seating. Professional engine builders that use Champion Power Shield Break-In Motor Oil will see the difference of our proven barrier of protection and is recommended for all types engines including flat-tappet or roller cams. Designed for tight clearance hard break-in to maximize compression and torque. Protects cams and lifters permitting high temperature ring sealing. Best performance in class among methanol and high-octane race engines. Requires no additional additives. After break-in, engine builders recommend Champion Racing or Champion Hot Rod Oils. 1 quart bottle.