FWIW that was NOT a dumb question...no such thing in the car world and the replies prove it. We will always be here to help 
If it's a non-turbo [I think it is] use Castrol GTX 10w30. Total w/filter should be about $25.00. If you take it to a service station make sure you point out where the drain plug is so they don't drain the transmission! It's the one towards the front of the car. And if at all possible buy a filter from eeuroparts or Saab. Someone here may have a recomendation for an off the shelf filter.
I also recomend starting the car and taking it for a spin until fully warm at least once a month...this is good to keep all of the moving parts happy.
If it's a non-turbo [I think it is] use Castrol GTX 10w30. Total w/filter should be about $25.00. If you take it to a service station make sure you point out where the drain plug is so they don't drain the transmission! It's the one towards the front of the car. And if at all possible buy a filter from eeuroparts or Saab. Someone here may have a recomendation for an off the shelf filter.
I also recomend starting the car and taking it for a spin until fully warm at least once a month...this is good to keep all of the moving parts happy.
