Are you also baffled by all the names, letters, and codes on hydraulic oils?
We're here to unravel the mystery and shed some light on the subject. You've probably heard of HLP 46 before. Clever minds might know it's a type of hydraulic oil, but what does it really mean? What does HLP stand for? These letters aren't just random—they each have a meaning, and we're here to spill the beans.
This article is based on DIN 51524 / IDO 6743-4 standards.
- H stands for the base hydraulic oil without additives.
- L could be said to stand for Longevity. So, an HL oil is a base hydraulic oil (H) with corrosion protection additives and aging resistance (L).
- P stands for Pressure, signifying high-pressure additives.
Therefore, an HLP oil consists of a base oil with corrosion and aging resistance additives, as well as additives that protect the oil from very high pressures.
- D stands for Detergent, indicating that additives have been added to prevent dirt deposits.
- V stands for Viscosity. Additives have been included here to improve viscosity-temperature behaviour.
Then there are some other interesting designations.
- CLP is a label for gear oil with active wear-reduction, inhibitors against rust and corrosion, detergents, dispersants and surfactants.
- ATF oils are Automatic Transmission Fluids with wear reduction additives.
- STOU stands for Super Tractor Oil Universal. This represents the current standard of tractor oils. For a tractor, this means that STOU oil can be used simultaneously for the engine, transmission, wet brakes, and hydraulics.
- UTTO Universal Tractor Transmission Oil. An oil with this designation can be used for the transmission, wet brakes, and hydraulics at the same time - just not for the engine! In this case, a separate engine oil is also required.
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