Returned from several months absence to my 425 with 36 hrs on. Tried to start 'er up ... no joy. Called Tazwell. Checked my oil level at their suggestion. It was way too high. I had about a gallon of gas diluting the oil. Anyone know why this happened? I've dealt with a lot of engines over the years but never had that happen before. Probably even more important, anyone know how to prevent a repeat of that from happening again? I thought cut off valve but that fuel line is really small diameter stuff!