Today's oil isn't what it used to be. The EPA has recently mandated that some components (zinc and manganese) be removed from conventional and synthetic off-the-shelf oils, and it's those components that protect your engine under normal and severe conditions...not only at break-in but throughout the engine's life. These extreme pressure protection components have been lost, and vital engine parts may suffer because of it. D.S.S. Xtreme Oil Additive MUST be used to restore this protection to your engine.