IMHO, you guys are playing w/ fire by adding additives to a good working engine. Albeit I am a strong fan of Lucasoil products, I found that that is a no-no with Satty engines. So after looking further into it, I learned that most additives are not good for Saturns in the long run because of the foam casting and seals on these types of engines. Most can cause harm more than help.
STP can be safely used, I use the black bottle for FI engines and it does remove water to an extent too as well as maintain a clean engine. Scheduled cleaning of the throttle body with an approved TB cleaner spray (you can get that at Saturn or any auto parts dealer, $4) will safely remove any debris or residue from your intake system. Using quality gas and oil can't hurt either.
Cheerrs and Happy 2004! marx404