The Toro Recycler series is a patented cutting technology that brings an innovative mulching technique that make your clippings ultra-fine to provide moisture and nutrients that feed back into your lawn. We call these nutrient rich grass clippings, LawnVitamins™. The Toro Recycler® 21 in. Self-Propelled Gas Lawn Mower features variable-speed functionality and rear wheel drive with a 140cc Briggs & Stratton engine. Great for homeowners seeking a lawn mower with a high-quality, user-friendly design. Toro products are known for smart features and proven dependability you can count on. No oil changes for the life of the engine. Just Top if Off.