Pour-point concerns have a long history. In 1905, waxy components in lube oils caused them to solidify even in moderately cool weather, making it impossible to hand-crank engines for starting. The first response was to fit little petcocks to each cylinder and, before attempting to start, pour a few cc of gasoline through them into the cylinders. The early motorist then waited as the gasoline dissolved the solidified oil, then continued with the long and arduous starting drill. If large aircraft piston engines of the 1940s had to be started in very cold weather, their lube oil was diluted after shutdown with aviation gasoline, reducing its cold viscosity. Upon starting and warm-up, the gasoline evaporated to atmosphere from the hot oil.