In most cases, the base oils are the same. The difference is that the thickener is different, which determines the viscosity of the oil. Hydraulic oil is generally up to 100#, and gear oil is above 1000#.
The other two oils are used in different working conditions. There are also differences in the additives in the base oil. Such as sulfur, phosphorus, and copper content.
Hydraulic oil is mainly used in hydraulic oil systems, which mainly require anti-wear properties, thermal stability, filterability, oxidation stability, water stability, etc.
In addition to the above requirements, gear oil There are also requirements for heavy loads on gears, and EP anti-extreme pressure additives may also be needed.
I would like to know the specific ingredients. This is Mobil’s trade secret and patented technology.