Royal Purple® located in Porter, Texas, produces a wide range of high performance lubricants for nearly every consumer and industrial application. Royal Purple® focuses exclusively on developing state-of-the-art lubricants that significantly outperform other synthetic and mineral based oils. Trust the oil from the Synthetic Expert - Royal Purple®. Royal Purple was acquired in 2012 by Calumet (CLMT), a leading refiner and processor of specialty hydrocarbon products headquartered in Indianapolis, IN.