What is the application range of gear oil 85w140?
2 Answers
Gear oil 85w140 is typically suitable for use in temperatures ranging from -16°C to 50°C throughout the year. Functions of gear oil: Gear oil should possess excellent anti-wear properties, load-bearing capacity, and appropriate viscosity. It should also have good thermal oxidation stability, anti-foaming properties, water separation performance, and rust prevention. Since gear loads generally exceed 490 MPa, and the load on hypoid gear surfaces can reach as high as 2942 MPa, gear oil accounts for approximately 6%-8% of the total lubricant consumption. Gear oil is a high-performance lubricant. Properties of gear oil: Suitable viscosity and good viscosity-temperature characteristics are fundamental properties of gear oil. Higher viscosity results in a thicker lubricating oil film, which provides relatively greater load-bearing capacity. Extreme pressure anti-wear performance is the most important and distinctive feature of gear oil. It prevents wear, scuffing, and scoring of gear surfaces during operation.
Having driven trucks for many years, I know that 85w140 gear oil is most suitable for heavy-duty vehicles like large SUVs, pickups, or trailers' differentials and manual transmissions, especially in high-temperature environments or during frequent long-distance driving. Its high viscosity and strong heat resistance prevent thinning, protecting gears from wear and extending component lifespan. Don't misuse it in small passenger cars—it increases power loss and fuel consumption. For routine oil changes, I always recommend checking the oil quality before autumn and winter to ensure there are no leaks or aging. These experiences have helped me avoid many repair troubles—safety first, after all.
