Spectro Performance Oils S.GSMC Golden Spectro 2-Cycle Synthetic Blend Premix, 1/2 Gallon Two-cycle engine Lubricant concentrate Significantly reduce excessive solvents (Present in most two-cycle blends) Running at leaner ratios provides a higher level of detonation protection, stops plug fouling and smoking Use according to motorcycle manufacturers' recommendations, or at 50: 1; this product exceeds API tc test requirements NOT for use in oil injection systems