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Yup, and notice how the primary source doesn't mention the steel tanks of Syrup? Because it's not universally true. I worked at two McDonald's in high school and I changed the syrup many times... it was in plastic bags. It was like a bag of wine, there is a small connector on the bag where it feeds into the syrup distribution system.

Basically ad copy.

That varies a lot based on location. Some McDonalds have a bare minimum of syrup going into the water.

They're supposed to calibrate it regularly. I did it many times.

i also recall that calibration, being dialed up when friends were likely to come in after a school dance, and the secret "dead product" bin full of fries mostly plus randoms, being shoved through the window, to a car full of friends upon request.