STANADYNE DIESEL PERFORMANCE FORMULA - 8 OZ. Meets all fuel system requirements regardless of make, model or year For all diesel powered engines. Specifically formulated to provide peak performance in both hot and cold weather. This is a year-round product. Increases Horsepower - with up to 5 point cetane gain to improve combustion, resulting in better acceleration, power and torque Reduces Fuel Consumption - independent tests show gains up to 9.6% in MPG Easier and Faster Starting - in all conditions