You can usually tell a two-stroke engine by the cloud of stinky smoke that surrounds it when it's first started up.
Two-stroke engines (also called two-cycle engines) require you to mix the oil with the gas in exact amounts, and most people like to eye-ball it.
Four-stroke (four-cycle) engines have a separate compartment for oil, so you don't have to measure things out like a scientist.
New snow throwers only come with four-stroke engines. The only two-stroke engines you'll find are the old ones that have already been around the block a few times.
If you're tired of mixing oil and sniffing fumes, it may be time for an upgrade to a cleaner, easier, 4-stroke model.
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