KENDAL - DQ is actually Ice Milk, at least it used to be. I grew up about ten miles from the garage where the first DQ machine was built. I used to work for a company that made the ice cream freezers for companies like Good Humor, Ben & Jerry's, Eddy's, Wells Blue Bunny, Deans. Places that make 100,000's GALLONS of IC every day. Our littlest machine made 100 gal/hour, biggest made over 1100 gal/hour. B&J ordered SIX of those biggest machines at one shot. I saw a show, Ultimate Factories, on Wells Blue Bunny, located in beautiful Le Mars IA, they have a freezer warehouse that holds something over TWO MILLION Gallons of IC. And it's a "Just in Time" mfg. plant.
ALL IC companies have cut out so much of the milk's butterfat now days the internal metal parts that used to be lubricated by the IC now have to have Teflon bushings.