I have done a boneheaded thing. I changed oil and filter on the motor and didn't top off after running the unit for a sec. I forgot. Today, I ran the hell out of it for 10 minutes and noticed it was making a heck of a clatter. Checked the oil and it was off the stick. Topped off and it still is making the loud clacking noise. I'm short of bread right now and terrified that I've destroyed my mower. Someone help me before I have an ulcer.