I have an old-style gas-powered lawnmower, regular residential size, and I just put too much oil in it. The dipstick measures about 3/4", and it looks like I went over by about 3/16". So I'm guessing about 25% too much oil. Do I need to go to the trouble to drain it and start over, or can I just go with it and let the level drop by itself over time? Obviously if the level was way over, I would have to drain it, but I am not sure if I can live with +25%. thanks!