What type of oil should I use in the Craftsman STD533710 lawn mower?
Use SAE 5W-30 oil for temperatures above 32°F. For cold-weather operation below 32°F, use fresh, clean winter-grade gasoline to ensure good cold-weather starting. Refer to the Lubrication Chart in the manual for specific oil viscosity recommendations. (Page 2)
From the official Craftsman STD533710 Lawn Mower manual, page 2
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