Yes I worked 4 years at a Prairie Farms Dairy that made ice cream just for Steak N' Shake to make their shakes with. NH3 was the refrigerant that was used to cool the tanks and hardening room. Every Sunday I had to drain the oil from the bottom of the tanks and the 3 cylinders of the Ice Cream Freezer. It was the most dangerous job there but it had to be done or the milk would not cool or ice cream get hard. Once the ice cream was made and packaged into 5 gallon containers, 80 contaioners were stacked 4 high on a pallet and put in the hardening room where it was a negative 25°F (25°F below zero). More than once a pallet of containers were spilled onto the floor and it didn't take long to freeze to the floor. It was a job to clean that up.
But yes oil will collect in the bottom of the cooling tanks and keep it from cooling.
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Today's Featured Article - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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