Hydraulic Fluid

Equivalent Options for Mobil DTE 25 Hydraulic Fluid

Hydraulic systems wear out unless they are protected by clean, high-quality anti-wear hydraulic oils. Without the right fluid, pressure in pumps and valves can create metal-to-metal contact, and that is a recipe for disaster.

Anti-wear (AW) hydraulic fluid comes in many different viscosity grades, so it’s important you get the right stuff if you’re considering switching from one brand to another (maybe to save money). A good way to know if a product may be compatible with your equipment is to consider the International Organization for Standardization (ISO) viscosity grade of the fluid you’re using now. Mobil DTE 25 meets the viscosity standards of ISO 46. 

Other popular products that fit into the ISO 46 category include:

If you’re not familiar already, the Truegard line of products is manufactured by Keller-Heartt. The Truegard brand is designed as a high-quality, cost-saving alternative to many industrial fluids. Whether you’re buying Truegard or a different brand of hydraulic fluid, remember you always save money when you order from Keller-Heartt because you do not have to pay shipping fees.

Truegard hydraulic oils are general-purpose hydraulic fluids formulated with refined paraffinic base oils to provide excellent anti-wear protection, oxidation and corrosion inhibition, and foam and aeration suppression. All grades have excellent demulsibility characteristics.

All of the hydraulic fluids listed above will have similar spec sheets. To help you decide if your equipment can operate with AW46 oil, here are the details on Truegard AW46:

  • Viscosity cSt at 40 degrees Celsius (104 degrees Fahrenheit) = 46
  • Viscosity index > 90
  • Pour point = −29 degrees Celsius (−20 degrees Fahrenheit)
  • Flash point = 226 degrees Celsius (439 degrees Fahrenheit)

When Hydraulic Fluid Needs Replacing

Hydraulic fluid can last a long time. However, some things can compromise a system and necessitate the addition of new fluid. This could be the case if water or air enters the system. The fluid can also degrade if there are rapid changes in pressure. This can cause vapor bubbles and cavitation, which may lead to damage to the metal in a system. Overheating hydraulic oil will increase its oxidation and decrease its effectiveness, too.

There are clear signs that you’ll notice when it is time to change out hydraulic fluid. For example, the oil may appear dirty, sludgy, or darker. If the fluid is foamy, then it has been contaminated with air. If it is milky, it has been contaminated with water. If components are sticking, machine cycles are taking longer, or your equipment is overheating, you may need to change out the fluid as well. 

Hydraulic Oil Cross-Reference: Truegard vs. Shell vs. Mobil

The chart below is a cross-reference for multiple hydraulic fluid viscosities—AW32, AW46, and AW68. This allows you to see which Mobil, Shell, and Truegard products may work in your system.

ISO Viscosity Grade

Mobil Product

Shell Product

Truegard Product


DTE 24

Tellus S2 MX 32

Truegard Anti-Wear Hydraulic Oil AW32


DTE 25

Tellus S2 MX 46

Truegard Anti-Wear Hydraulic Oil AW46


Univis N 46

Tellus S2 VX 46

Truegard Anti-Wear Hydraulic Oil AW46


DTE 10 Excel 46

Tellus S3 V 46

Truegard Anti-Wear Hydraulic Oil AW46


SHC 525, ZN free

Tellus S4 ME 46

Truegard Anti-Wear Hydraulic Oil AW46


DTE 26

Tellus S2 MX 68

Truegard Anti-Wear Hydraulic Oil AW68


Univis N 68

Tellus S2 VX 68

Truegard Anti-Wear Hydraulic Oil AW68

If you have questions about selecting the right hydraulic fluid, we’re always happy to help. Contact the experts at Keller-Heartt for personalized advice.


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