Driven Racing Oil GP-1 15W40 is a semi synthetic engine oil that has been specifically engineered and tested to deliver increased horsepower, better engine and wear protection. Featuring the unique properties of Pennsylvania grade oil compounded with synthetic components and ZDDP (zinc) that provides excellent film strength and reduced friction.Race grade protection and performancePerfect choice for classic road and competition carsHigh zinc content for maximum protectionHigh temperature and high load protectionThe GP-1 is made with Pennsylvania grade oil which is recognised in the racing community as the finest base oils for high performance lubricants. A high zinc semi synthetic blend offering more than 30% better wear protection when compared to the competition.1 quart (0.946 litre)