Briggs & Stratton 18 HP Vanguard V-Twin OHV Horizontal Engine. V-Twin 90°° overhead valve design runs cooler, cleaner and more efficiently to provide higher HP output with less displacement and less carbon build-up. Longer valve life and improved fuel economy. Full lubrication with spin-on oil filter cleans oil and protects engine components to ensure maximum lubrication and long life. Not for sale in California.