What types of hydraulic fluids are there?

Due to this variety of tasks, there are different hydraulic oils depending on the application area. The DIN 51524 standard classifies hydraulic oils by defining minimum requirements.

Hydraulic oils have various tasks to fulfill. The main task is to transfer pressure in the hydraulic system. The hydraulic oil must also lubricate, cool, and protect the moving parts from corrosion, wear, and deposits. It also has the task of removing contaminants (e.g. due to abrasion), water and air.

Due to this variety of tasks, there are different hydraulic oils depending on the application area. The DIN 51524 standard classifies hydraulic oils by defining minimum requirements.

Hydraulic oils

The specifications of mostly mineral oil-based hydraulic oils are composed of the following letters:

H = Hydraulic oil
L = with anti-corrosion and oxidation additives (aging resistance)
P = with EP additives (EP = Extreme Pressure: high-pressure resistance)
V = with VI improver (VI = Viscosity Index: improved viscosity-temperature behavior)
D = with detergent and dispersant additives (detergent = cleaning / dispersant = keeps dirt suspended)

From the combination of these letters, the so-called hydraulic oil specifications with different properties are then formed. The most widespread specifications are:

DIN 51524-2 HLP

Hydraulic oil with increased corrosion and oxidation protection and improved high-pressure resistance. The equivalent ISO classification is ISO HM.

DIN 51524-3 HVLP

Hydraulic oil with increased corrosion and oxidation protection and improved high-pressure resistance. Compared to an HLP oil with improved viscosity-temperature behavior. The equivalent ISO classification is ISO HV.

DIN 51524-2 HLPD

Hydraulic oil with increased corrosion and oxidation protection and improved high-pressure resistance. In addition to an HLP oil with detergent and dispersant properties. The equivalent ISO classification is ISO HV.

DIN 51524-3 HVLPD

Hydraulic oil with increased corrosion and oxidation protection and improved high-pressure resistance. Compared to an HLPD oil with improved viscosity-temperature behavior. In addition to an HLP oil with detergent and dispersant properties. The equivalent ISO classification is ISO HV.

Biodegradable hydraulic oils

There are also separate specifications for biodegradable hydraulic fluids. These always start with the letters HE (Hydraulic Environmental). The best-known standard is DIN ISO 15380 HEES, which represents a biodegradable hydraulic oil based on saturated synthetic ester.

Looking for a suitable product for a specific specification?

With our norm search, you can find all Midland hydraulic oils that meet one of the hydraulic oil specifications in just a few clicks:

Midland products with DIN 51524-2 HLP standard
Midland products with DIN 51524-3 HVLP standard
Midland products with DIN 51524-2 HLPD standard
Midland products with DIN 51524-3 HVLPD standard
Midland products with DIN ISO 15380 HEES standard

Stay in Motion Smoothly - Lubricants from Midland

With Midland's lubricants, everything runs smoothly! Whether for passenger cars, trucks & buses, motorcycles & ATVs, marine, construction machines, industry, agriculture & forestry or classic cars - we offer you the full range of quality lubricants for all areas of application. This includes engine oils, transmission oils, hydraulic oils, additives, coolant protection and supplementary products. Since 2017, we have had the most modern fully automated lubricant production plant in Switzerland to constantly provide you with consistent and constantly carefully controlled quality. That's what our company slogan "Swiss Quality Oil" stands for.

Midland: A Brand of the Swiss Traditional Company Oel-Brack AG

The Midland brand was launched by Oel-Brack AG in 2004, which has been producing and importing products of American oil companies under license as a family business since 1880. Under the Midland brand, the Swiss family business trades in heating oil and fuels domestically and produces quality lubricants for domestic and foreign markets in Aargau (Hunzenschwil). In Switzerland alone, Midland lubricants are delivered to over 3000 passenger car and truck garages, motorcycle dealers, workshops, yards, forest offices and industrial companies, while almost half of the total production is exported.

Find the right lubricant with just a few clicks - Midland's Oil Finder

What engine oil should I use for my classic car? What hydraulic oil is best suited for my motorcycle? What should I look for when buying additives? Finding the right lubricants is not easy due to the large selection of different products. But now that's a thing of the past. Midland provides you with a convenient online Oil Finder, with which you can now reach the right lubricant with just a few clicks. Simply select the vehicle or machine and browse through the individually compiled product selection. You will receive product recommendations for each application area, including important interval hints for changing. Try it now!

Buy lubricants at Midland and get good advice

Midland offers quality lubricants and provides expert advice. If you have any questions about their products or would like to purchase motor oil, their specialists are available to assist you via phone +41 62 889 10 30, email info@oelbrack.ch, or their contact form. They are dedicated to providing personalized advice and are happy to answer your questions with their years of experience in the field of lubricants and fats.
Contact Midland for expert advice and support.

to overview

What is Midland?

Midland is an internationally active private label of the company Oel-Brack AG. The family business specializes in the production of high-quality lubricants, which are sold both in Switzerland and internationally under the brand Midland – Swiss Quality Oil. Additionally, the company deals in heating oil and fuels in German-speaking Switzerland, where there are also various Midland gas stations.

Which is the best grease?

Whether truck & buses, motorcycles & ATVs, marine, construction, industry, agriculture and forestry or classic cars - to keep wear to a minimum, most machines require regular maintenance and greasing with lubricating grease. But what exactly is this and how do I choose the best grease? Midland reveals the most important information in this article.

What do additives in lubricants do?

There are a large number of different additives which are used in lubricants. In general, they are intended to fulfill the following tasks:

Protect surfaces from wear and corrosion
Protect against oil aging
Improve oil properties

Which transmission oil is the right one?

Regardless of whether it is for cars, trucks & buses, motorcycles & ATVs, marine, construction machines, industry, agriculture & forestry or classic cars - which transmission oil is the right one primarily depends on which transmission needs to be lubricated. Due to the variety of different transmissions, there are also various transmission oils.

What kind of engine oil do i need?

Every engine is different, which is why there are different types of engine oils. To ensure that the engine is always optimally lubricated, the oil changes should also be carried out according to the manufacturer's specifications. With the right oil and the right change intervals, the lifespan of an engine can thus be extended. However, with the large number of engine oils that are now available, it is not always easy to keep track. We can help you find the right engine oil.