There are many types and grades of gear oil. Different models and grades are suitable for different models, and suitable gear oils should be selected for different operating conditions. For these types of gear oil, a friend asked what 85w90 gear oil means. It's actually a viscosity grade mark. There are not only 85w90 gear oils, but 80w90 gear oils. What's difference between 85w90 and 80w90?
Transmission oils can be divided into one-class and all-weather oils, and one-class oils can be divided into high-temperature and low-temperature oils. Gear oil 85w90 is an all-weather all-weather viscosity type with a wider practical temperature range and can be used throughout year. The letter W in gear oil viscosity grade indicates low temperature gear oil. The number before W indicates low temperature viscosity. The lower number, lower viscosity, better fluidity and performance at low temperatures. higher viscosity at high temperature and higher heat resistance.
The difference between 85w90 and 80w90 is difference in viscosity at low temperatures. 85w90 and 80w90 have same viscosity at high temperatures, and 80w90 has a lower viscosity at low temperatures than 85w90, and fluidity of gear oil is better. used at lower temperatures Better performance.