My snow blower manual recommends 0w30 oil but every store recommends 5w30.
Which would be better for the longevity of my snow blower and why?
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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.
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.