Synthetic Blend | TC-W3 | Gallon Mercury Optimax, Yamaha HPDI, BRP Ficht, DI. Ideal for oil injection systems or pre-mix applications. Significantly reduced aquatic toxicity to fish compared to other outboard oils on the market today. Reduces ring sticking, deposit formation and exhaust port blockage. Less friction allowing for easier starting. Formulated to improve performance and extend engine life by reducing wear on critical engine components. Excellent performance with lower quality fuels.