Perfect for performance street vehicles, classic cars, imports, and competition/race engines requiring a 15W-40 or 10W-40 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 15W-40. DRIVEN GP-1 Racing Oils are formulated for High Performance Engines/Racing applications only. This engine oil will NOT MEET any current API or OEM Engine Oil Specifications. These engine oils are not intended for use in vehicles equipped with catalytic converters.