10W-40 Driven Racing Oil BR break-in motor oil is used to break-in and dyno all engines. Petroleum oil provides the highest levels of zinc and phosphorus for flat-tappet engines. Additive package promotes ring seal and provides maximum protection available for cams and lifters during initial break-in. It requires no additional additives and is good for full power pulls on the dyno, one night of racing or up to 400 miles on the street. It provides maximum compression and generates maximum horsepower. Compatible with methanol and high-octane race fuels. Combined with Driven Racing Oil engine assembly grease, BR provides the highest levels of protection for camshafts, lifters, wrist pins, distributor gears, push rods and valve retainers. The Driven Racing Oil BR break-in motor oil can be used for up to 2 hours of break-in/dyno time before changing. Sold by the quart.