I have Yard Machine: Briggs and Stratton 550 Ex Lawn Mower and I gave it a tune up in December. Today it started spewing oil all over the lawn mower. I realized that the main leak was in the back part of the motor, specifically where the oil is stored. I've posted a picture of where it's leaking. I also noticed the the oil dip stick tube was loose. In ten minutes all the oil was gone. If anyone has any idea on what happened, I'd really appreciate it.