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There are so many different types of gear oil available on the market. As a beginner, it might take half a day just to find the right one. Therefore, understanding how to identify the different types of gear oil is something that these beginners need to know and pay attention to. https://www.chevronlubricants.cn/wp-content/uploads/2019/08/20190805033041.jpg First of all, regarding the viscosity of gear oil, the SAE viscosity classification system is used; there are seven viscosity grades: 70W, 75W, 80W, 85W, 90, 140, and 250. The appropriate viscosity grade is chosen based on the seasonal temperatures. Also, those marked with “W” are winter-type gear oils. The others are non-winter oils (lacking the “W” mark). However, many gear oils available on the market today are suitable for use throughout all seasons, such as SAE75W-90 and SAE85W-90; these are classified based on their dynamic viscosity at 100°C. When choosing gear oil, we must strictly follow the specifications in the vehicle’s user manual to select the appropriate gear oil type. If the gear oil has too high a viscosity, it not only affects the performance of starting in low temperatures but also increases the operating resistance of the engine. If it is too low, it will increase the wear resistance of the bearing, thereby reducing its service life. So, if the vehicle has a hypoid gear drive axle, it is necessary to use hypoid gear oil; otherwise, it will cause severe wear on the gears. Therefore, before looking at the different types of gear oil, it is essential to understand what characteristics and functions each type has. Once this information is known, it becomes much easier to choose the gear oil that is suitable for one’s needs.