Snow Blower Oil
Snow Blower Oil is used to help propel a snow blower to its maximum capabilities. If you are seeing black smoke from your snow blower you may need to change the oil. Consider doing 2 or 3 oil changes in quick succession (using an inexpensive oil of the proper weight), warming up the engine well between each and draining thoroughly, and see if that gets the contaminants out.
Snow Blower Oil is made by many different companies. There is also many different types of oil available to choose from. Synthetic oil runs better at colder temperatures, so that means better protection on startups.
Not only that, but Synthetic Snow Blower Oil lasts longer, so if you forget to change it, you're still protected. Make sure to change the oil at least once a season. This can help with buildup and sludge.