The MS 171 is part of STIHL’s new generation of fuel-efficient, low emission chain saws. It features a stratified charge engine, modern construction technology, a long-life air filter system, anti-vibration system, side-access chain tensioner and toolless translucent oil caps with retainers. This saw is the smart choice for homeowners needing to cut firewood, fell small trees or perform clean-up around the home, cottage or small property.