To completely purge cooling system from air takes many complete heating/cooling cycles, so it's perfectly normal having to top off reservoir tank. It's still advisable to check for leaks on a new car, but if you don't smell anything funky in the engine compartment, and level goes from max to min (or just a bit below), it'd be normal. Only advice is to add whatever the car came with, meaning we need to ask dealer what they use. I prefer to buy a gallon and do the topping off myself.
Does anybody know what this car uses? By the color, I'm betting some 'proprietary' stuff, like most manufacturers. Guess we have to buy it there until it's time to replace it.