The engine is a Briggs and Stratton 500 series 140cc power, 4 stroke motor. The oil comes with it but, to the bottom fill line, not the top. The instructions are, do not use economy gas. I always use premium and my lawnmowers last 6-8 years with NO repairs. Change the oil yearly, without fail, and in this case, use 4-stroke oil, which is a little thicker.
Came out of the box intuitively and took me 5 minutes to get it up and running, including gas and oil. Intelligently boxed to save me stupid extra steps, which I hate.
The blade is unlocked and ready to cut. It is a sharp blade but, these need sharpening or replacing every two years. It´s cheap, quick and will save your back from a dull blade having to go over and over a section.