the best would be to use 10w-30 synthetic oil all year long
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Depends on which model 11 h.p. engine you are referring to. Click the link and look yours up. Read the small print at the bottom conceding if it has an oil filter or not.
10w - 30
SAE-30
Generally Briggs calls for 30W but you can also use 10w30 especially if you are using it in cool temperatures.
SAE 30 SF or better rating
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10w30 0r 10w40 both seem to work well.
Briggs and stratton engines use different oils depending on the temperature to which the engines will be used. Generally sae30 oil should be used for mower engines
Sae 30w if it is over 50 Fahrenheit. 10w-30 if it is under.
regular 30 W, it says elsewhere on the Net, at least for some models in your category
SAE 30 weight in the summer or SAE 10w30 if you use the engine in cool temperatures.