If it is completely Alcohol Free then it is safe to use. Alcohol and harmful solvents used in Cetane boosters can cause preignition, which is likely to damage fuel injectors. When water molecules are present in diesel, alcohol causes the water to emulsify, or mix into the fuel. It then travels through the injection system at extremely high pressure and temperatures. The abrasiveness of the water can score your injectors and get vaporized, turning into steam. This will eventually damage the tip of the injector, resulting in uneven spray patterns and wasted fuel. Over time, the alcohol and harmful solvents will also cause the swelling and breakdown of gaskets, as well as dry out the entire fuel system. Higher cetane numbers actually have minimal benefits with modern diesel engines and could cause more harm than good. (Via Amazon)