Welcome to JustAnswer.com! My name is DriveFast71(Ron) and I will do my best to answer all of your questions completely and accurately.
The coolant capacity is 8.7 L (9-1/4 US qts) (this includes filling the resevoir tank also). You can use the Prestone 50/50 (it's actually a very good brand name), no problem. As long as it is "green" in color.
This car has been babied, has 81k on it, I run Mobile 1 oil.......traveling across the country...belts & hoses replaced, new tires...anything else I should REALLY check??