The Red Line Engine Oil Break-In Additive is designed to be used during the engine break-in process with engine oils that are lacking in zinc and phosphorus (ZDDP). The additive contains anti-wear additives that are needed to protect against excessive camshaft and valvetrain wear whilst allowing the piston rings to bed in correctly.Gives engine components the protection needed without effecting piston ring sealingCan be used with conventional or synthetic oils and it can be used during engine break-in or through out the life of the engine455ml Bottle: Treats up to 11 litres of engine oilTechnical Data Sheet