Briggs & Stratton 4-Cycle Engine Oil - 3 Oz. 100091 Genuine Briggs & Stratton 4-Cycle Micro Oil is design exclusive for use on Briggs & Stratton Force engines Designed specifically for our engines and can save on costly repairs while maintaining valuable warranty coverage. Contains 3 ounces Formulated for engines less than 50cc Model number 100091WEB