What kind of oil in the power steering?

Working fluid or special oil enhances the transfer of pressure from the pump to the hydraulic cylinder and lubricates all friction pairs. The vessel for a liquid can be a tank. It has a filtering component, and in a traffic jam, a probe to set a limit.

In our article we will look at what power steering means, what kind of oil should be added to it.

Classification and Interchangeability

In the people, it is customary to divide oils by color and assume that they can be mixed according to a given attribute. This is absolutely not true. It is also rash to think that it is always possible to mix oils of the same color. Far from it. They can differ significantly in viscosity and composition. Why do they make them colored? Consider the features associated with the color of the oil:

  • Red color is the Dexron family (mineral water and synthetics of this color should not be confused). These oils are of different types, but at the same time, they are only suitable for automatic transmissions.
  • Yellow color - a group that is used mainly for power steering in Mercedes cars
  • Green color - a group of oils, which are mainly used in Peugeot, Citroen and VAG. Mineral and synthetics of this color can never be mixed. This oil is not suitable for automatic transmission.

The power steering has a sufficient amount of rubber parts, and synthetic oils, in turn, have a rather detrimental effect on rubber products, due to their chemical aggressiveness. In order to add such oil to the power steering, its rubber parts must have a certain composition. Those systems produced quite a few. And if the instructions do not indicate the possibility of using synthetics, then only mineral oils should be poured into the power steering.

Differences GUR oils from automatic transmissions

Consider the difference in oils for power steering and automatic transmission, and what oil is poured into the power steering. The table below shows the hydraulic fluids for power steering brand (PSF) and automatic transmission type (ATF):

GUR oils (PSF):

Oils for automatic transmission (ATF):

Hydraulic fluid functions

1) the fluid acts as a working fluid that transmits pressure from the pump to the piston
2) lubricating function
3) anti-corrosion function
4) heat transfer for system cooling

1) the same functions as GUR fluids
2) the function of increasing the friction rest of the clutches (depending on the material of the clutches)
3) friction wear reduction function

Additives contained in liquids

1) friction reducing additives (metal-metal, metal-rubber, metal-fluoroplastic)
2) viscosity stabilizers
3) anti-corrosion additives
4) acidity stabilizers
5) tinting additives
6) antifoam additives
7) rubber protection additives (depends on the type of rubber compound)

1) the same additives as GUR oils
2) anti-slip and anti-slip friction additives corresponding to the specific friction material. Different friction materials require different additives. From here went different types of automatic transmission fluids (ATF Dexron-II, ATF Dexron-III, ATF-Type T-IV, and others)

Hydraulic fluid capabilities

  • fluid plays the role of the working fluid, which transmits pressure from the pump to the piston;
  • lubricating function;
  • anti-corrosion function;
  • transfers heat to cool the system.
  • It's the same as for GUR oils;
  • The possibility of increasing friction rest clutches.

Additives that are part of the liquid

  • additives abrasion (metal-metal, metal-rubber, metal-fluoroplastic);
  • viscosity stabilizers;
  • anti-corrosive additives;
  • acidity stabilizers;
  • tinting additives;
  • anti-foam additives;
  • rubber preserving additives;
  • The same additives as for hydraulic boosters;
  • Anti-slip and anti-slip additives for automatic gearboxes suitable for precise friction material. Different components of friction clutches require different additives. Based on this, we observe a variety of types of gearbox oils (ATF Dexron-II, ATF Dexron-III, ATF-Type T-IV, and others).

A variety of Dexron-s (Dextrons) was originally designed for use in automatic transmissions (automatic transmissions), so these oils are called transmission oils. This, in turn, is not entirely clear, because under this “name” previously produced thick oils of the brand: GL-5, TAD-17, TAP-15 for automatic transmissions and rear axles with hypoid gears. Such oils are more liquid than transmission oils, and therefore they are easier to call ATF, which means “Automatic Transmission Fluid”

Having examined the table, we see that the difference in oils for the power steering and for the gearbox is only in the presence of new additional additives.They, in turn, do not affect the quality of the oil and the work of car parts. Therefore, answering the question of what kind of oil in the power steering is better to fill, power steering or automatic transmission, you can definitely answer that any.

The Japanese initially use the same oils in their cars, while manufacturers of European models use an excellent course to link consumers. They advocate that no other oil should be poured into the car, other than that which they indicate in the instructions. At the same time, practice has shown that the use of high-quality, but not the original oil does not affect the performance and resource of the power steering.

Mixing system

In order to avoid major problems, it is worth remembering that you can mix yellow and red oils of the same type - mineral or synthetic. But greens should not be confused with any others, only with their own kind. As practice shows, sometimes when added to the green oil of yellow foam was formed. In such a case, flush the system before using a different color of liquid.

When mixing mineral Dexron-s and yellow oils GUR no extraneous events did not occur.Their additives are perfectly mixed with each other and continue to fulfill their role in the new composition.

To understand what kind of oil in the hydraulic booster can be added to another, already existing there, consider three groups of oils.

  • The first group. It includes "conditionally mixed" oils. It can be the same oil only from different manufacturers, they can be mixed in different ways. This does not affect the work of the hydraulic booster and will not reduce its resource.
  • The second group. It includes oils that are allowed to mix only with each other. However, they can be used instead of other oils, under one condition: it is necessary to completely flush the system from the oil produced.
  • The third group. This is a group containing oils, the use of which is spelled out in the instructions (you must strictly follow it), which determines the specific type of oil for each vehicle.

Now you know what oil to pour into the power steering.



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