8355GMS This high performance oil is the world's finest SAE 20w50 fully synthetic multigrade engine oil. It has been uniquely engineered for classic performance racing, with shear stable viscosity index improvers. This product incorporates our unique nanotechnology ultra low friction additive system. It is formulated with full ZDDP (zinc phosphorus) for ultimate protection. A high performance SAE 20w50 semi synthetic multigrade engine oil. Made with enhanced performance additives and shear stable viscosity index improvers in synthetic and mineral base. Formulated with full ZDDP (zinc/phosphorus).