Bel-Ray MC-1 2-Cycle Synthetic Racing Lubricant is a smokeless premium high Viscosity Index, high molecular weight fully synthetic ester lubricant specifically formulated for high dilution ratios. For premix in high performance air-cooled or liquid-cooled 2-stroke engines in motorcycles and ATVs under racing conditions, Bel-Ray MC-1 has unsurpassed film strength and load carrying ability for superior anti-wear.