HR4 SAE 10W-30 Synthetic Hot Rod Oil Features storage protection additives that guard against rush and corrosion during winter storage. 10W Multi-grade formula provides excellent start-up protection for flat tappet, overhead and roller cam engines. No ZDDP additives required. Viscosity typical of 10W-30. Driven Racing Oils are formulated for Classic & Racing applications only. This engine oil does NOT MEET any current API or OEM Engine Oil Specifications. These engine oils are not intended for use in vehicles equipped with catalytic converters. For SDS Tech Data Sheet, click here