Most Briggs engines that small take 1 pint of oil .
40oz
You can get that info on the Briggs and Stratton website. Just go to: http://www.ereplacementparts.com/briggs-and-stratton-parts-c-16758.html?gclid=CPCZj4vGr58CFZdM5Qodp3bDsA and enter your engine model number.
48 ounces
48 oz
Click the link and find your engine for the exact capacity.
Most single cylinder Briggs engines hold 40 oz of oil. SAE-30 type oil
20 oz. when bone dry, but only about 16 oz. will come out during an oil change.
You should always have 20 fluid ounces of oil in a Briggs and Stratton 5.5 HP lawn mower. This equals out to roughly 1.6 quarts.
A 15hp mercury requires a fuel to oil ratio of 50:1, roughly one pint of 2 cycle oil, to six gallons of gasoline.
Click the link.
A Briggs & Stratton 6 HP Engine takes a little less than 1 quart of oil. When you get to about 3/4 poured in, Stop and check your oil. It may take a hair more but not a full quart.