Hydraulic Oil

Hydraulic oil : One of the most important oils in the automotive, heavy, aviation and aerospace industries is hydraulic oil. The main task of hydraulic oil is power transmission and lubrication in the relevant part.

This type of oil makes the hydraulic parts move better and transfers power to other parts easily.

The role of hydraulic oil in the car is to act as a fluid to move the parts and speed up their movement.

There are two main

types of hydraulic oil


1- Type of petroleum oil


2-A type of synthetic oil that uses pressure and current factors to transfer power. Hydraulic oil has vital applications in passenger aircraft such as moving wing surfaces and landing gear, and in heavy industry pumps, jacks and cranes.


Oil performance depends on the correct viscosity of the oil, system type, operating temperature, acidity, R&D, absorption rate.

Moisture has the resistance of the oil layer.

Hydraulic oil standards are subject to the International Organization for Standardization (ISO) and some standards of important factories such as SIEMENS, ALESTOM, etc.

Hydraulic oil classification

The classifications of hydraulic oil are a subgroup of different fluids with varying performance levels. Below is a list of common hydraulic oil classifications and their respective descriptions:

  • HL – Refined mineral oils with anti-oxidation and anti-rust properties
  • HM – HL with improved anti-wear properties
  • HR – HL oils with VI improvers

For a detailed list, you can speak with our knowledgeable team by calling us on 0098 21 88741214 or alternatively, you can read our explainer of esyekta website .  



What is hydraulic oil?

Hydraulic oil is a non-compressible fluid that is used to transfer power within hydraulic machinery and equipment. Otherwise known as hydraulic fluid, hydraulic oil can be synthetic- or mineral-based.
At  yekta co, as a hydraulic oil supplier, we deal with 99% of mineral-based hydraulic oils.
Although this useful fluid is commonly used in the transfer of power, hydraulic fluid can act as a sealant, coolant and lubricant within machinery and equipment.


The main difference between synthetic and mineral based hydraulic oil

The majority of oils which are produced are either mineral based or synthetic. Mineral based hydraulic oils are derived from crude oil fractions whereas synthetic hydraulic oils are made using chemically produced base fluids.

Synthetic oils can be formulated to impart superior physical properties in comparison to mineral oils, for example high temperature performance, biodegradability and oxidation stability.

What is hydraulic oil used for?

Hydraulic fluids are used in many applications across every industry. To give you an idea of the vast array of uses for hydraulic fluid and why industrial hydraulic oil is so important, here are 10 examples of equipment and machinery which use hydraulic oil:

  1. Forklift Trucks – The hydraulic system within forklift trucks and stackers is important to help power the incredibly strong forks which need to lift some super-heavy goods.
  2. Log Splitters – The ram mechanism on a hydraulic oil log splitter requires hydraulic fluid inside to give it that immense power which can split logs with ease. Log splitters are also known as wood splitters!
  3. Automotive Lifts – Car lifts (car jacks, automotive lifts, etc.) require hydraulic jack oil to aid their impressive power range! This type of machinery depends heavily on reliable hydraulic oil for safety as well as performance. Hydraulic fluid for a car lift tends to have a higher viscosity grade for high pressure.
  4. Wright Standers – A wright stander is a stand on mower which is usually well-suited to cemeteries and other restrictive grassy areas. The hydraulic part of these machines requires hydraulic oil for power.
  5. Snow Ploughs (Snow Plows) – Hydraulic oil for a snow plough and ploughing equipment is essential in the powerful operation of the hydraulic lift, tilt and angle movements of the snow plough blade. The cold weather conditions associated with the use of a plough means that the hydraulic fluid used in a snow plough will be blended with antifreeze additives.
  6. Skid Steers (Skid-steer Loader and Skidsteer) – Skid steer hydraulic oil is as versatile as the machine it works with. For the many tasks this machine can competently complete, hydraulic oil plays a big role at all times.
  7. Aircraft (aviation) – In the aviation sector, it is essential that aircraft hydraulic oil is reliable as it is used for aviation control systems, aircraft hangar doors, aircraft jacks and aircraft controls.
  8. Air Tools – Air tools and air compressors require high-pressure hydraulic oil which contains anti-wear additives for protection.
  9. Tractors – Tractor hydraulic oil is necessary for the operation of hydraulic brakes and hydraulic systems on agricultural vehicles and machinery. For your hydraulic oil tractor supply, you may want to use a reputable manufacturer to ensure your expensive machinery and vehicles are well looked after and protected.
  10. Cruise Ships and the Marine Industry – If you’ve been lucky enough to go on a cruise ship then you’ll have felt the comforts out at sea. Hydraulic oil is used aboard many marine vessels for the stabilisers. The stabilisers reduce the amount of roll, which can affect the ship’s balance and cause you to experience unfriendly sea-motion sickness. This is just one of the many other applications on marine vessels which require hydraulic oil.

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Hydraulic oil viscosity conversion chart

When it comes to hydraulic oils, viscosity is the measurement of its resistance to flow and it is an important property of hydraulic fluids. This means the fluid will resist compression at different rates depending on its viscosity and take longer to pass through an orifice as the viscosity increases. Hydraulic fluid with high viscosity will be thicker and harder to compress and move as opposed to low viscosity hydraulic oil which will be thinner and pass through easier.

The viscosity of a hydraulic fluid is measured in Centistokes (cSt) and usually at temperatures of 40°C & 100°C. The value will always have the temperature next to it as without this the value will be meaningless. A fluid’s viscosity is measured in a petroleum laboratory using a viscometer !

Hydraulic oil viscosity is important for each different application.

The wrong viscosity could cause damage to equipment or have poor results in function.