Bel-Ray® MC-1 Racing Full Synthetic 2T Engine Oil is a 2-stroke motorcycle racing oil that was developed in the 1970s specifically as a high dilution ratio pre-mix racing 2T motorcycle oil and continues to offer riders of historic off-road motorcycles the quality engine oil that they have been using for years. It is a true icon in the off-road motorcycle industry. MC-1 is recommended for use in air-cooled, non-power valve 2-stroke racing engines and is intended as a premix not designed for injection/autolube systems. MC-1 continues to provide the absolute best in early off-road engine lubrication. Not suitable for methanol fuel.