Oil viscosity is under the specified temperature (eg 100 ℃) measured data, the same viscosity 14.55m㎡ 100 degrees / s, 15W-40 oil, high-grade oil at room temperature, people will feel thin, but people feel relatively low-grade oil thick. Because high-grade oil with base oil refining depth high viscosity index, viscosity-temperature resistance, viscosity with temperature change is small. Some manufacturers to cater to a minority of users at room temperature (hand) feels viscosity method, adding inferior thickening agent in the oil, the use of non-standard base oil, make people feel good drawing performance, this oil can easily oxidative deterioration, and harm to the machine no one's interest. Chinese military special oil Holdings Limited is a research and development of international standards, the production of special oil a large comprehensive chemical companies, to meet the oil market competition and enterprise development strategic needs, Chinese military special oil Group Limited authorized Shijiazhuang Golden Road Lubricant Co., Ltd. is the sole producer in mainland China area vendors.