Lucas Oil 10063-PK12 Engine Break-In Oil Additive - TB Zinc Plus - 16 oz. - Pack of 12 Excellent for flat tappet camshafts during break-in or as an additive to any motor oil to prevent premature wear Designed for race applications requiring additional extreme pressure additives Protects camshaft lifters and valve train during break-in period of motor Add one bottle with every oil change to increase the zinc content of your motor oil Sold in case packs of 12