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What are the differences between engine oil & hydraulic oil?

Engine oil and hydraulic oil serve different purposes and are formulated differently to meet the specific requirements of their respective applications. Here are the main differences between the two:

  • Purpose:
    • Engine oil: Engine oil is primarily designed to lubricate the moving parts of internal combustion engines, such as those found in cars, trucks, motorcycles, and other vehicles. It reduces friction, dissipates heat, seals gaps between components, and helps to keep the engine clean by removing contaminants. Using the incorrect grade of motor oil can damage certain engines. Care should always be taken and the manufacturer recommendation adopted on every occasion.
    • Hydraulic oil: Hydraulic oil, on the other hand, is used in hydraulic systems to transmit power. It is used in machinery such as hydraulic lifts, cranes, excavators, and industrial equipment. Hydraulic oil transmits force within a hydraulic system, enabling the system to perform tasks like lifting heavy loads or moving components.
  • Viscosity and Additives:
    • Engine oil: Engine oils often have additives that enhance their performance under high temperatures, pressure, and shear forces experienced within an engine. They come in various viscosities to accommodate different engine designs, operating conditions, and climates.
    • Hydraulic oil: Hydraulic oils typically have a more consistent viscosity and are designed to maintain their viscosity over a wide range of temperatures. They also contain additives to prevent foaming, corrosion, and wear within hydraulic systems.
  • Compatibility:
    • Engine oil: Engine oils are specifically formulated to work with the materials used in internal combustion engines, including various metals, seals, and gaskets.
    • Hydraulic oil: Hydraulic oils are designed to be compatible with the materials commonly found in hydraulic systems, such as seals, hoses, pumps, and valves.


In summary, it’s crucial to use the correct type of engine or hydraulic oil for each application to ensure optimal performance and longevity of the equipment.

At GEM OILS, we pride ourselves on being a premium supplier for all your lubricating needs.

We stock a number of engine oil products for a variety of vehicles and machinery, including Gem Europulse 10W-40, Gem Fully Synthetic 5W-40, Gem Fully Synthetic F 5W-30, Gem Profleet 10W-40, Gem Super Turbofleet Long Drain 15W-40, Gem Semi-Synthetic 10W-40 and much more.

You can view our range of Engine Oils here.

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