The cooling system is pressurized, but the overflow reservoir is not. You can add as much as you want to it and all that will happen is if the fluid gets hot and expands, it will pour out of the overflow and on to the ground. Which is not cool. Because dogs will lick it up and die. Don't kill dogs.
But the point is that there's no need to be fooling around with the drain plug or a turkey baster. Just add some straight coolant. Be careful, if it's cheap, it's probably pre-mixed with water. That would totally defeat the purpose. But add a liter to your overflow and you'll be fine. The people at Mr. Lube are using some $5 antifreeze tester that is total bullsh1t. I got taught the same thing when I worked at a gas station. It's a rip off. But getting your cooling system FLUSHED is a good thing to do every so often, especially on older vehicles. But make sure they're actually flushing the system and not just draining it and filling it up with new fluid. That's like changing the oil but not the filter.
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