Although hydraulic oil and lubricant oil have something is same, such as they are antiwear(Antiwear EP Additive), cooling, antirust, cleaning, and sealing. But they aslo have a lot of different, and it is these differences that make hydraulic oils not be used as lubricants. If you want to find out why engineering machinery hydraulic oil can't be used as lubricating oil, first you must understand what is lubricating oil and what is hydraulic oil. Next, let's explain what is a lubricant and what is a hydraulic fluid.
Lubricant oil is a type of lubricant that acts to reduce friction between two objects due to contact between two relatively moving objects. It's made of Base Oil and Lubricant Additive. In addition, it has the function of cooling, antirust, cleaning, sealing and cushioning and so on. Lubricating oils are divided into diesel engine oils and gasoline engine oils, each of which has different grades to choose.
Hydraulic oil is a hydraulic medium used in hydraulic systems that use liquid pressure energy. It acts as an energy transfer, anti-wear, system lubrication, anti-corrosion, antirust, cooling, and sealing in the hydraulic system. Hydraulic oil is a special oil that transmits pressure. It is divided into common hydraulic oil, anti-wear hydraulic oil and low-condensation hydraulic oil. The engineering machinery hydraulic oil is a hydraulic system special oil developed for the actual working environment requirements of construction machinery and die casting machine. Compared with other hydraulic oils, engineering machinery hydraulic oil has better wear resistance, antirust(Anti-rust Additive) and demulsibility. , antioxidant stability, hydrolysis stability and thermal stability. 
The same point and difference between engineering machinery hydraulic oil and lubricant oil. Same Point From the above explanation, we can see that lubricating oil and hydraulic oil also have the functions of anti-wear, cooling, rust prevention, cleaning and sealing. And this is why we often hear some words about the use of hydraulic oil as a lubricant. Main difference in function In the main role, lubricant oil and engineering machinery hydraulic oil is different. The main function of the lubricant oil is to reduce the damage caused by the friction of the object; the main function of the hydraulic oil of the engineering machinery is to transmit the pressure (power). Because of their different main functions, lubricants pay more attention to reducing friction, reducing wear and preventing metal sintering. Hydraulic oils pay more attention to viscosity index. It requires hydraulic oil to perform well at high temperatures and ensure low temperature. Easy to flow and reduce energy consumption. 
Although hydraulic oil and lubricant oil have something in common,They also have a lot of different. Therefore, at the end of the article, remind the friends in the construction machinery industry that the hydraulic oil can not be used as a lubricant.
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