Hey, I know this has NOTHING to do with Oldsmobiles, but this game is so great that I had to commemorate it somehow.
I don't have the time to make this page as great as it could be, but I have some good links to some great GTA sites, they have hacks and cheats for both the full version, and the demo. If you have the demo, I highly recommend that you download the timer crack from either site.
Go to Gouranga-
In my opinion, this is the best and most comprehensive GTA site on the web.
Gomi's GTA Chop Shop-
This is another great GTA site. I think this one was the first with the timer crack.