It's not something I plan on doing again. I had a very old car, that I didn't do regular maintenance on (pre-BITOG). I was going to do some work on it, and planned to flush the engine as part of the 'revitalizing' project. I was getting married in the near future, and a family member bought my new wife and I a newer car (2002 Chev. Cavalier) as a large wedding present, so the old car was given to my FIL.
He doesn't believe in these adds, so I just hung onto it, and couldn't be bothered returning it to Wal-Mart, old and dinged-up. I also didn't want to use it such a new car, (and I don't do my own oil changes) so I was just looking for an easy way to get rid of it - figured it couldn't hurt in a full tank of gas. But just proper fuel adds from now on in the car...if any.