What kind of oil does a snow blower use?
Beside this, can I use SAE 30 in my snowblower?
You are going to operate your snowblower in cold weather so using SAE 30 weight oil is a good choice because it contains a high resistance to flow due to its greater viscosity, or thickness.
Likewise, can you use car oil in snowblower?
It is the same (subject to below) as car oil, in that it doesn't use oil specifically for small engines. It's more that it is made for specific applications and has appropriate specs. If you use terms like "small engine" oil, some might interpret that a 2 cycle oil, which is mixed with the fuel in a 2 cycle engine.
So, while synthetic will do better in temperature extremes, (extremes not seen in a properly running snow blower) it will get dirty at the same rate as regular oil. Therefore we will need to replace it at the same intervals as regular oil, but at a greater cost.