Torco T630050CE V-Series SAE 50 "ST" Motor Oil Bottle - 1 Liter Bottle V-Series "ST" motor oils are formulated using highly refined petroleum base stocks and Torco's race proven MPZ additive providing better cooling, cleaning, ring seal, deposit control and anti-wear protection Maintains viscosity and provides thermal stability under high temperature environments; V-series is specifically formulated for Harley and custom v-twin engines MPZ frictional loss technology prevents oil breakdown at high temperatures, providing excellent wear protection, extending piston and valve train life Meets or exceeds: JASO MA/API SG SAE 50: recommended for use in early model air cooled v-twin engines where specified; commonly used in Harley (pre-1984: knuckle, pan, shovel) and other early model custom v-twin applications