Two stroke engines require oil to be pre-mixed with fuel before entering the cylinders. Quicksilver 2 Stroke Oil is specially formulated to the highest standards for use in 2 stroke outboard engines. Engineered to comply with the high warranty standards for mercury engines, as well as exceeding TC-W3 standards. Quicksilver 2 Stroke Oil is ideal for low-mid horsepower outboard engines and will also reduce rust and corrosion of internal components. For the full range of products available at BCF, call into our store today.