Vanguard synthetic performance engine oil is warranty certified and suitable for all ail cooled 4-cycle small engines. *The use of this high quality detergent oil assures compliance with Briggs & Stratton and Vanguard Warranty requirements regarding the use of appropriate oil. Recommended for use in lawn and garden equipment and pressure washers. Especially effective in continues use commercial/industrial equipment. The use of synthetic oil does not alter required oil change intervals in Briggs & Stratton or Vanguard engines.