OVER the past few years, operational pressure and power density in hydraulic systems have increased significantly, which in turn has increased the susceptibility to wear and premature failures. This is why the quality of hydraulic oil has an ever-increasing effect on the service life and reliability of hydraulic systems.


Hydraulic oils from LIQUI MOLY meet the highest standards, ensuring more efficient operation of hydraulic equipment.

Lubricant specialist LIQUI MOLY understands this and in developing its HyPER hydraulic oils has subjected them to the toughest test - the Bosch Rexroth RDE 90235 test. All tested oils mastered the process with flying colours and are among very few in the world that fulfil the highest standard.

The pump test introduced by Bosch Rexroth in 2015 goes far beyond that which current DIN and ISO standards require. The problem with these standards is that they do not keep up with technical developments that have taken place in hydraulic systems over the past few years.

RDE 90235 is a scientifically standardised test procedure which checks the behaviour of the lubricants as well as the interplay in the key hydraulic pump and motor components under realistic working conditions - a test scenario completely oriented in practice.

Conventional tests work with 350 bar while the new standard uses up to 500 bar. The previous approvals by Bosch Rexroth lose their validity and are replaced by the RDE 90235. There’s no getting around oils with the new approval for machines with Bosch Rexroth hydraulics.

The HyPER hydraulic oil series by LIQUI MOLY comprises only oils that fulfil the highest valid standard. These lubricants contribute towards a longer service life of the hydraulic components because, for example, they reduce wear to the nonferrous metals and nitrate layer of pistons and bores. At the same time, they increase operational safety and minimise the risk of breakdowns.

Their improved seal compatibility minimises unsealed points of hose connections. Even the number of burst hoses is significantly reduced.

Compared with conventional hydraulic oils, HyPER hydraulic oils generally allow change intervals that are twice as long. This leads to the significantly higher quality oil not simply offering significantly more technical benefits, but also being better-priced than conventional hydraulic oils.

HyPER hydraulic oils can be used in all stationary and mobile machines that require a HLP hydraulic oil. Alongside the Bosch Rexroth RDE 90235 approval, the lubricants fulfil or exceed the following specifications: Parker Denison HF-0, HF-1, HF-2; Eaton E-FDGN-TB002-E; Eaton Brochure 03-401-2010; Fives-Cincinnati P-68, P-69, P-70; and DIN 51524-2 HLP.

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