The Senix chainsaw features a 4-cycle engine that does not require mixing gas and oil but remains lightweight and powerful. With a 4-cycle engine, there is no need to mix gas and oil. Four-cycle engine has lower emission and is more environmentally friendly than 2-cycle. Full crank engine design provides longer engine life, lower vibration and easy maintenance. The chainsaw features 18 In. Oregon bar and chain for smooth cutting and auto choke and compression release for easy starting. The auto oiler provides continuous lubrication to the bar and chain to ensure high performance and trouble free cutting. The chain brake stops the chain in the event of kickback to provide an extra measure of safety to the operator. Includes bar cover. All Senix 4QL gas powered products are backed by our 2-year limited warranty for your peace of mind.