Bel-Ray Si-7 Synthetic 2T Engine Oil is specifically formulated for use in injector / autolube systems, but can be used as premix. The oil is formulated to eliminate smoke and carbon residue while providing the highest level of protection for all 2-stroke engines. Bel-Ray Si-7 Synthetic 2T Engine Oil meets API TC, JASO FD and ISO L-EGD performance classifications ensuring the highest level of detergency for better performing, longer running engines. For injector / autolube systems or premix in ratios recommended by the engine manufacturer, between 20:1 and 50:1. Equally suitable for air-cooled or liquid-cooled high performance 2-stroke motorcycle engines. For best performance and protection of high performance engines operating over a wide temperature range at high RPM and high loads or at idling speeds. Synthetic - Synthetic formula for maximum engine protection and performance.