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Is it ok to put 5W40 oil in a snowblower engine that called for 5W30?

No, it is not recommended to put 5W40 oil in a snowblower engine that calls for 5W30. While both oils have the same viscosity rating at low temperatures (5W), the 5W40 oil is thicker at higher temperatures than 5W30. This means that 5W40 oil may not flow as easily in the engine, which could lead to problems such as engine damage. It is important to use the oil that is specified in the owner's manual for your snowblower engine.