Draining the motor oil from a Dewalt pressure washer
Since this pressure washer has a drain plug, start by removing it, removing both fill caps, and allowing the oil to drain into the collection container.  For a smaller machine without a drain plug, use a PVC 90-degree elbow, attached to a straight piece, tilt the machine, and allow oil to drain into your collection container.

Place the oil-catch container under the machine and remove the drain plug, as well as both fill caps.

Place the oil catcher under the machine and drain.

tilt the machine to ensure you remove most of the oil from the motor.