What is the difference between motor oil and hydraulic oil

The differences between hydraulic oil and motor oil are as follows:

1. Different functions:

The main function of hydraulic oil is to transmit power, similar to the gasoline used in our cars, which can provide relatively large power to the car. And the main function of engine oil is to reduce the friction of the engine and avoid damaging the engine.

2. The composition of additives is different

Due to the difference in function between the two, the ingredients added to the oil are also quite different. Engine oil contains a variety of functional additives such as cleaning and dispersing agents, while hydraulic oil contains additives such as anti-oxidation, anti-rust, and anti-wear additives in the additive composition.

3. Oil viscosity index:

Generally speaking, motor oil is comparatively denser, so it is a bit thicker. Hydraulic oil, on the other hand, has a relatively low density, so it is thinner than engine oil in terms of viscosity.

4. Different colors:

Since the density of the hydraulic oil is relatively low, it should be lighter in color. Whereas, the oil is thicker, so the color looks stronger.

The main differences between engine oil and hydraulic oil are as follows:

From the perspective of the field of use, hydraulic oil is mainly used in the field of industrial lubricating oil, while engine oil is generally used in the field of automobiles, which is some differences in the field of use.

From the perspective of external color, the color of hydraulic oil is generally golden yellow and transparent, while the engine oil is relatively blue.

From the point of view of manufacturing and production, the general hydraulic oil is mostly semi-refined oil, and they have a significant feature that they are resistant to high pressure, and the manufacturing process is slightly worse than that of engine oil. One of the most significant characteristics of engine oil is lubrication, compared with hydraulic oil, its internal tissue particles are smaller than hydraulic oil, and the viscosity is generally higher than that of hydraulic oil.

In daily application, many old equipment in the description of the information, it is written that the use of oil lubrication, the old equipment marked with oil is not actually the current conventional use of internal combustion engine oil, but mechanical oil, most of these old equipment lubrication has been replaced by hydraulic oil, there will also be some factories use internal combustion engine oil lubrication.

Internal combustion engine oil is a lubricating oil specially used for gasoline engines and diesel engines produced according to the requirements of engine workers, requiring a variety of performance such as high cleanliness and dispersion, and the oil contains several functional additives such as cleanliness and dispersion.

Hydraulic oil is mainly used in all kinds of hydraulic oil system, its viscosity grade is determined by the working conditions of the hydraulic system, and the additives used are anti-oxidation, anti-rust, anti-wear and other additives, which are completely different from internal combustion engine oil. In general, hydraulic fluids cannot be used as internal combustion engine oils due to their lack of clean dispersibility. However, in order to simplify the variety of oil used on site, internal combustion engine oil (viscosity suitable) is also used as hydraulic oil in individual cases.

However, its performance indicators such as demulsification, hydrolysis stability, etc. cannot meet the requirements of hydraulic oil specifications. Therefore, in underground, water, and humid environments, internal combustion engine oil must not be used as a substitute for hydraulic oil.