25yrs, funny you should ask that question. My engine light came on once when a little water managed to get into the gas, eventually it went off, and then last week, my H got gas in my car at a different station, and guess what the check engine light came on. In the manual, one of the things that could cause it is bad gas. Well, time for filling up the car came again, and H wasn't able to get to the gas station for me, so I went to my regular place, and it took another couple of days or so, but the light went off the other day.
