Clean Burn, a manufacturer of boilers and furnaces that transform used motor oil into free heat, exhibited at the 2008 ConExpo in Las Vegas in March.

Clean Burn, a manufacturer of boilers and furnaces that transform used motor oil into free heat, exhibited at the 2008 ConExpo in Las Vegas in March. According to the company, more than 80,000 Clean Burn products located throughout the world burn approximately 120 million gallons of used oils each year on-site, at the point of generation.