Red Line 81403 Engine Break-In Oil, 16 Ounce, 1 Pack 81403 Engine Break-In Additive 16 oz One 16oz bottle treats up to 12 quarts of motor oil-in many cases, one bottle can serve two engines or oil changes Provides conventional motor oils with antiwear additives like zinc and phosphorus (ZDDP) necessary to protect against camshaft and valvetrain damage on break-in Allow pistons rings to seat properly with less-slick oil, while antiwear additives protect other engines components to avoid excessive wear Improves protection at startup, lower oil temp, cleanliness