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NotTaR of small Gasoline Engines and Rotary Lawn Mowers : So you put gasoline in the oil filler ho..  
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So you put gasoline in the oil filler hole

Don't panic, just get it out of there. Drain the oil/gas mixture completely and refill with the proper new engine oil. If you want to be doubly sure, run the engine for a minute or so to mix any of the remaining contaminated oil with the new oil, then drain and refill again. It really shouldn't have done any damage if you get it out of there reasonably quickly (I don't know what effect gas might have on the oil seals over time though).