It couldn't have been the same pancake syrup viscosity as the shelf additive, right?
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The actual "invention" of what is now known as "STP" was originally invented by German scientists during WW-2 as a response to Germany's need for lubrication of the German war-machine vehicles. It was alleged by WW-2 U.S. Army divisions in Africa that overtook German infantry vehicles (mostly of the original Volkswagen design) that the Germans employed "engine oil" that is now known as STP formulation full-strength in the VW air-cooled 4-cylinder engines, which successfully traveled through the hot African Desert war-front without seizing due to friction and extreme heat. How the German's original chemical synthesis formulation found its way to the U.S. after WW-2 is not known, but most likely came along with many of the other German inventions.