The MS 261 C-M features low emissions, high fuel efficiency and the advanced STIHL M-Tronic™ engine management system. STIHL M-Tronic™ helps deliver maximum performance across a wide range of cutting conditions. The system digitally monitors changes in elevation and temperature and automatically adjusts for fuel quality, varying octane levels and dirty air filters. The MS 261 C-M also features redesigned cylinders and a slimmer, ergonomic housing for an impressive power-to-weight ratio. See it for yourself in our Dealership today. *A majority of STIHL gasoline-powered units sold in the United States are built in the United States from domestic and foreign parts and components.