Snow blower : 0w30 or 5w30
Most engines have several weights of oil that are allowed, typically with one of them being the recommended weight. In addition, outside temperature affects which oil weights can be used. Most manuals will have a chart with temperature ranges for each oil weight.
My Toro snowblower lists 10W30 and 5W30 with the following temperature chart:

I'm sure your snowblower's manual would list all oil weights that are allowed. I would suggest following the manual rather than some generic advice.