oooooh too cold....I should stay indoors and put another log on the fire...no seriously use a HOT plug! I would preheat my engine at those kind of temps too - I use an old hairdryer and heat my motors to at least 40º C before starting.For engines that are still in the run in period I go to 70-80ºC..Just like any engine most of the wear between piston and cylinder occurs during the warming up period and glow engines don't have the benefit of piston rings to take up the slack...