Most push lawn mowers are not equipped with oil drain plugs. Therefore, it is safe to gently turn your mower into an upside down position in order to drain the old oil, and/or old gas. A mower that still has oil in the crankcase, however, should not be left upside down for a prolonged period of time.
About this Author
Lisa Larsen has been a professional writer for 18 years. She has written radio advertisement copy, research papers, SEO articles, magazine articles for "BIKE," "USA Today" and "Dirt Rag," newspaper articles for "Florida Today," and short stories published in Glimmer Train and Lullwater Review, among others. She has a master's degree in education, and is a member of the National Society of Collegiate Scholars.