Is Higher Gear Oil Viscosity Always Better?

[StAlan]

Gear oil viscosity is not always better when higher; the appropriate level is sufficient. The basic performance characteristics of gear oil are as follows: 1. Sufficient extreme pressure anti-wear properties. Extreme pressure anti-wear properties are the most important and primary feature of gear oil, which prevents wear, scuffing, and scoring of gear surfaces during operation. 2. Good demulsibility. If gear oil emulsifies upon contact with water, it can severely affect the formation of lubricating oil films, leading to scuffing and wear. 3. Good oxidation stability and thermal stability. Excellent thermal oxidation stability ensures the service life of the oil. 4. Good anti-foaming properties. If generated foam does not dissipate quickly, it can hinder the formation of oil films at gear meshing points, and the entrained foam reduces the actual working oil volume, affecting heat dissipation. 5. Good rust and corrosion prevention. Corrosion and rust not only damage the geometric characteristics and lubrication state of gears but also cause further deterioration of the gear oil, creating a vicious cycle.