Did you check the oil level BEFORE using your blower? Generally in the user manual, it will indicate that the oil level should be checked before each use. You can also try contacting Briggs & Stratton directly regarding this issue. I have worked with them at my job before (regarding warranty issues), and sometimes they are willing to make exceptions for some situations. If you checked the oil before using it, and the oil plug came out during use, they might be willing to cut you some slack. Good luck!