The fill list is here:
http://www.mtdparts.com/webapp/wcs/stores/servlet/KnowledgeCenterArticleView?storeId=10101&catalogId=19502&langId=-1&pageName=en_US/knowledgeCenter/knowledgeCenterArticles/SnowBlowerStorage.html
Related to gas:
Drain any fuel left in the tank using the Arnold Siphon pump. The Arnold Siphon pump can be purchased on this website and where mower parts are sold.
Finally, you should add fuel stabilizer to your fuel ... and fill your unit's fuel tank. This is better than storing it empty. That's because an empty fuel system exposes any bare metal parts within it to air and moisture - which leads to rust and also allows gaskets and O-rings to dry out, crack and shrink, causing eventual problems. In addition, to completely drain fuel from an engine is difficult. Unless you blow out and dry the fuel lines, enough fuel can remain to become stale and cause problems. Keep the engine level in storage. Tilting can cause fuel or oil to leak. If you plan on covering the snow thrower, make sure air can get under the cover. Don't try to "seal it up."