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.Choose the right fuel for your mower. For best starting results use Non-ethanol fuel with an octane rating of 87 or higher. Use fresh fuel less than 30 days old, add fuel stabilizer to reduce starting problems