I had about a half gallon of S&W that I found in my back room last week. I checked it, it seemed to be ok, so I brought it to the field last Wednesday and tried it on my Protege. The engine started and ran just fine with no problems at all. The plastic bottle was sealed (with the cap on tight, I mean) so it was not exposed to any moisture (alcohol absorbs water) and it did not separate.

CGr.