Mechanical butter (industrial grease) generally refers to calcium-based grease, which is made by thickening mineral lubricating oil with medium viscosity with natural fatty acid calcium soap. Although it is an old variety in the 1930s, it is still widely used in China, and can be used to lubricate small and medium-sized motors, pumps, tractors, automobiles, metallurgy, textile machinery and so on. The early calcium-based grease was nicknamed "butter". The brands of mechanical butter are Great Wall, Mobil and Tiancheng Meijia. , as well as Huilide, Yanshi Hua Shan (yssh), Changlongrun, Lingcheng, Fenglanqi and Shenke, these brands are also good.