Highly concentrated premium ethyl ether formula for gasoline and diesel engines. Designed to start stubborn engines fast in cold weather. Effective down to -65 F. Prestone Premium Starting Fluid can help start engines with either too little fuel or too much as in the case of a flooded engine. This high ether formula is designed to ensure ignition because of its broad range of flammability of between 2 per cent and 36 per cent of ether in air.