How much oil for 15 hp Briggs horzitanal shaft?

For a 15 HP Briggs & Stratton horizontal shaft engine, you typically need about 1.5 to 2 quarts of oil, depending on the specific model. Always check the engine's owner's manual for the exact oil capacity and recommended oil type to ensure proper lubrication. It's important to use the correct grade of oil, usually SAE 30 for warmer temperatures or 5W-30 for colder conditions. Make sure to check the oil level using the dipstick before each use.