Designed for competition vehicles, classic cars, and imports with high-performance engines requiring a 20W-50 viscosity. GP-1 is compatible with Methanol, E85, and high octane race fuel. Blended with genuine Pennsylvania Grade base oil, GP-1 achieves a higher Pressure-Viscosity Coefficient for excellent HTHS film thickness. GP-1 delivers maximum engine protection by utilizing Driven's High Zinc (ZDDP) additive technology. Designed for all high performance builds, ideally street-track performance vehicles with either flat tappet, roller, or overhead cam engines. Viscosity typical of 20W-50. Viscosity typical of 20W-50. Requires no additional ZDDP additives. Sold as 12 quarts.