Starting fluid is a , which is used to aid the starting of , especially during cold weather or in engines that are difficult to start using conventional starting procedures. It is typically available in an can, and may sometimes be used for starting direct injected diesel engines or spark engines running on . Some modern starting fluid products contain mostly volatile such as , (the main component of natural gasoline) with a small portion of , and (as a propellant). Some formulations contain or as both propellant and starting fuel. Historically, , with a small amount of oil, a trace amount of a and a hydrocarbon propellant has been used to help start internal combustion engines because of its low 160 °C (320 °F) .
