The advanced technology of an E3 spark plug allows the flame front to grow unimpeded to create a more complete burn increasing power and reducing the amount of fuel used. E3’s advanced spark technology produces cleaner combustion. E3 is used in multiple small engine applications especially in lawn and garden. The ground electrode is designed with E3’s patented Diamond FIRE technology which is proven to improve power increase fuel efficiency and dramatically lower hydrocarbon emissions in long-term use. A premium spark plug with a 100 000 mile warranty. To make certain E3.12 is correct for your machine please reference your owner’s manual.