Briggs & Stratton recommends high quality detergent straight 30 weight but this can result in hard starting and may damage the engine at colder (below 40 F) temps. Multi-viscosity standard automotive oils (5w-30, 10w-30, etc.) are acceptable but will result in very high oil consumption at ambient temperatures over 40 F, and may void your warranty. High quality synthetic multi-viscosity oils are best for all temperatures.
Cross reference John Deere oil filter GY20577 to Briggs and Straiten filter number?
What kind of oil for Suzuki GZ 125 marauder?
sae30
The recommended oil is 5w30 full synthetic oil.
straight 30 or a 10w30
5w30
10w - 30
SAE-30
18 to 20 oz
Briggs 19.5 oil filter
Briggs and Stratton only recommend using their own brand of lawnmower oil. This oil is available in stores for around $6 for 18oz. This particular oil is designed to be compatible with air cooled engines.
SAE 30 weight full synthetic oil.