What type of oil should I use in my Craftsman snow blower?

Use 5W-30 engine oil with a minimum classification of SF/SG. For engines 208cc and 243cc, use approximately 20 oz (600 ml), and for 277cc, 357, and 420cc engines, use approximately 37.2 oz (1100 ml). Do not use nondetergent oil or 2-stroke engine oil as it could shorten the engine's service life.