I'm an idiot ...
put some oil in my car today, (it's a 94 Geo Metro). Convinced myself that all the smoke was just from some oil I had spilled ... finally noticed that the whole front of the car was covered in oil. Oil fill cap gone, though I think engine is still OK ... now I just need to get a new cap in time for work tomorrow afternoon. So ... are they interchangeable, or do I need a Geo-metro specific oil cap? I guess I'm going to be walking to whatever store/junkyard I go to, so would prefer to get it right the first trip ...
Thanks, Jonah