Lucas Oil Engine Break-In Oil Additive protects camshaft lifters and valve train during engine break-in period. It is excellent for flat tappet camshafts or as an additive to any motor oil to prevent premature wear. Contains zinc and an exclusive blend of extreme-pressure additives. Protects camshaft lifters and valve train during break-in period of engine. Exclusive blend of extreme-pressure additives. Add one bottle with every oil change to increase the zinc content of your motor oil. Designed for race applications requiring additional extreme-pressure additives. Dyno testing shows a more efficient break-in when used, resulting in less engine run time prior to race day.