What is the application scope of 85w-90 gear oil?
2 Answers
85w-90 gear oil is suitable for manual transmission vehicles. Working conditions of gear oil: The contact area between gears is very small, basically line contact, and during movement there is both rolling friction and sliding friction. Therefore, the working conditions of gear oil are quite different from other lubricants. Due to the small contact area between gears, the pressure they bear is very high. The tooth surface pressure of some heavy machinery reducer gears reaches 400-1000MPa, and the operating conditions of hypoid gears in automotive transmission systems are even more demanding with heavier loads. The pressure at the contact points can be as high as 1000-4000MPa. Under such high pressure, the lubricating oil is easily squeezed out from between the teeth, which can easily cause scratches and wear on the tooth surfaces. Therefore, gear oil must have the performance to keep the tooth surfaces in a state of boundary lubrication and elastohydrodynamic lubrication under high loads. Functions of gear oil: Lubricate the transmission system, reduce wear on gears and moving parts, ensure normal operation of the transmission system, and extend service life. Reduce friction and transmission losses in gear transmissions, improving mechanical efficiency. Cool transmission components. During gear transmission, a large amount of heat is generated due to tooth surface contact friction. If not dissipated in time, it can cause
I usually drive with 85w-90 gear oil, which has a wide range of applications, especially in places like manual transmissions and rear axle differentials. During cold starts in winter, it flows well, allowing gears to lubricate quickly. In summer, its viscosity remains stable under high temperatures, preventing overheating damage. I use it in my SUV, and when frequently shifting gears or driving on off-road terrain, it protects the gears from wear and reduces noise significantly. Remember, it's suitable for both new and old cars, but don't mistakenly add it to automatic transmission systems, as it can cause problems. Regularly check the oil level and replacement cycle—typically every 50,000 kilometers. Proper maintenance can extend the vehicle's lifespan, making driving more worry-free, cost-effective, and safer.
