My girlfriend has a '98 Saturn SC1. It’s a decent little car, from what I can tell, but she was out of the country and her friend who she let use it apparently let it just sit for a few months because the tabs expired. (She had the new ones, they just didn’t get put on … weird but no one ever asked me about it so I assumed all was well. Anyhow, the battery was dead and replaced, which was OK since it was a 5 year battery that had 6 years on it, so no biggie. Now, though, the coolant is a bit low. The weird thing is, there’s absolutely no Hot Fill line on the coolant bottle. Do I really have to wait for it to be cooled down to add coolant? Also, is there a “best” coolant to use or is the standard universal stuff OK? Hopefully it is, since that’s what’s in my Neon and I’d hate to have to have 2 jugs of coolant for those rare top off needs.