Blade Changer r BladeBoss and BladeBoss Pro are trademarks of BladeBoss Products, LLC.  © 2009 - 2017 U.S. Patent 8209837 tm Made in USA Instructions for Walk-Behind and Self-Propelled Homeowner Class Mowers TIP: It’s a good idea to place mower on its side with the oil fill tube on the high side to minimize oil leakage.  It’s always better to not turn mower over completely resting on the motor. How to Use