Product Description BR break-in oil protects flat-tappet camshafts and lifters during break-in and it provides excellent ring seal. Specifically designed for breaking-in engines, BR break-in oil provides high levels of Zinc, Phosphorus and Sulfur in a mineral base oil. Combined with Joe Gibbs driven engine assembly grease, BR provides the highest levels of protection for camshafts, lifters, wrist pins, distributor gears, push rods and valve retainers. BR is fully formulated and requires no additional additives. Amazon.com Motor oil is made from crude oil and is used to lubricate, clean, and cool engines. Types of motor oil include conventional, synthetic, diesel, bio-based, hybrid (blends of conventional and synthetic), and recycled oils. Motor oil varies in weight and viscosity, as well as additives that some manufacturers add to the oil during the refining process. A numerical code system created by the Society of Automotive Engineers (SAE) grades motor oils according to viscosity--the higher the number between 0 and 60, the more viscous (thicker) the oil is. Most consumer motor oils are graded by two numbers, with the first number indicating cold weather (Winter or "W") performance.SAE 15W-50This oil has a weight of SAE 15W-50, meaning it has an SAE viscosity rating of 15 in cold temperatures and a rating of 50 at normal operating temperature. Always check your vehicle's owner's manual to verify that this is the correct weight of motor oil for your vehicle.Conventional Motor OilThis oil is a conventional motor oil, meaning it is refined from crude oil or petroleum products. Conventional motor oils may or may not have additives included after refining. Conventional motor oils are more versatile than synthetic or hybrid motor oils, because they are suitable for use with nearly all types of modern vehicle engines, from cars and trucks to motorcycles, ATVs, farm equipment, and more.Break-In OilBreak-in oil is primarily designed to protect the ring seals and rotating assembly components of new vehicles, reducing initial start up wear. Highly refined mineral oil is usually preferred for engine break-in oil, with additives (usually containing zinc) often added.