97 900 Engine froze
 

My 97 900 ran out of gas and was left overnight with the flashers on. Went back to get it with AAA they put gas in and tried to jump start it. Couldn't get it to start.
Took it to a Saab mechanic and he now tells me the engine froze. Had a recent oil change and had oil in it. Otherwise was in perfect running condition. Anyone ever heard of this? It makes no sense at all! Thanks.