Mobil DTE 24 Ultra Hydraulic Oil
ISO VG 32 Antiwear Hydraulic Oil for High-Pressure Industrial Systems
Mobil DTE 24 Ultra is a high-performance ISO VG 32 antiwear hydraulic oil designed for demanding industrial hydraulic systems using high-pressure, high-output pumps and precision hydraulic components.
Part of the Mobil DTE 20 Ultra Series, it combines enhanced wear protection, strong oxidation and thermal stability, deposit control, corrosion protection and controlled water separation. Its keep-clean performance is particularly useful in modern hydraulic systems with close-clearance servo and proportional valves where deposits can interfere with reliable operation.
Mobil DTE 24 Ultra is the ISO VG 32 grade in the series and can replace legacy Mobil DTE 24 in compatible applications.
Key Benefits
- ISO VG 32 hydraulic oil
- High-performance antiwear formulation
- Designed for high-pressure hydraulic systems
- Suitable for high-output hydraulic pumps
- Helps protect pumps, gears, bearings and valves
- Strong deposit and sludge control
- Keep-clean performance for tight-tolerance hydraulic components
- Excellent oxidation and thermal stability
- Controlled demulsibility for water separation
- Enhanced corrosion protection
- Strong anti-foam performance
- Suitable where small amounts of water may enter the hydraulic system
- Up to 2X longer oil drain intervals versus qualifying competitive hydraulic oils in Mobil testing
- Approved by Bosch Rexroth under Fluid Rating List 90245
- Denison HF-0, HF-1 and HF-2 approved
- Eaton E-FDGN-TB002-E approved
- Recommended for applications requiring Fives Cincinnati P-68
- Meets current DIN 51524-2 and ISO 11158 L-HM requirements
ISO VG 32 Hydraulic Oil
Mobil DTE 24 Ultra is classified as ISO VG 32.
Typical viscosity values are:
- 33.4 mm²/s at 40°C
- 5.8 mm²/s at 100°C
- Viscosity Index: 115
ISO VG 32 should only be used where the equipment manufacturer specifies or permits that viscosity grade.
Antiwear Protection for Hydraulic Pumps
Mobil DTE 24 Ultra is formulated to protect hydraulic system components operating under high pressure and load.
Applications can include systems using:
- Vane pumps
- Piston pumps
- Hydraulic gears
- Bearings
- Servo valves
- Proportional valves
Mobil's current approval list includes Bosch Rexroth Fluid Rating List 90245, Denison HF-0/HF-1/HF-2 and Eaton E-FDGN-TB002-E.
Keep-Clean Performance and Deposit Control
Deposit formation can cause problems in modern hydraulic systems, particularly where valves operate with extremely small internal clearances.
Mobil DTE 24 Ultra is formulated to help reduce:
- Sludge
- Varnish
- Oxidation deposits
- Valve deposits
Its keep-clean technology helps protect servo and proportional valves from sticking or malfunction caused by contamination and deposits.
Extended Hydraulic Oil Life
Mobil states that DTE 20 Ultra Series oils have demonstrated up to 2 times longer oil drain intervals compared with similar competitive hydraulic oils.
The comparison applies against qualifying competitive oils with approximately 100 viscosity index, zinc-based antiwear chemistry and at least ISO 11158 L-HM and/or DIN 51524-2 HLP performance.
Actual hydraulic oil life depends on:
- Operating temperature
- Contamination
- Water ingress
- Filtration
- System design
- Duty cycle
- OEM maintenance requirements
Oil analysis is recommended when establishing extended drain intervals.
Oxidation and Thermal Stability
Hydraulic oil is exposed to heat and oxygen throughout its service life.
Oxidation can contribute to:
- Oil thickening
- Varnish
- Sludge
- Filter restriction
- Valve deposits
Mobil DTE 24 Ultra provides strong thermal and oxidation stability to help maintain system cleanliness and support longer oil and filter life under demanding operating conditions.
Water Handling and Demulsibility
Water contamination is a common issue in industrial hydraulic systems.
DTE 24 Ultra uses controlled demulsibility to help separate water from the hydraulic fluid so it can be removed from the system.
For ISO VG 32, the technical data lists approximately 20 minutes to 3 mL emulsion at 54°C under ASTM D1401.
Mobil specifically identifies the series for hydraulic systems where small amounts of water may be unavoidable.
Corrosion Protection
Current typical test results include:
- ASTM D665 Procedure B Rust Test: Pass
- ASTM D130 Copper Strip Corrosion: 1A
These laboratory results support the fluid's corrosion-protection performance in compatible hydraulic systems.
Systems with Gears and Bearings
Mobil specifically includes hydraulic systems containing gears and bearings among DTE 20 Ultra applications.
DTE 24 Ultra has a typical FZG Scuffing Fail Load Stage of 11.
This test characterizes load-carrying performance and does not make DTE 24 Ultra a substitute for dedicated industrial gear oil where gear oil is specified.
CNC and Precision Hydraulic Systems
Mobil DTE 24 Ultra is suitable for hydraulic systems where deposit control is critical, including systems using close-clearance servo valves and numerically controlled machine tools.
Potential applications include:
- CNC machine tools
- Automated production equipment
- Hydraulic presses
- Injection molding equipment
- Industrial power units
- Precision manufacturing machinery
Is Mobil DTE 24 Ultra Zinc-Free?
No. Mobil DTE 20 Ultra products contain zinc as part of their antiwear chemistry.
For applications specifically requiring a zinc-free hydraulic oil, Mobil recommends considering the Mobil DTE 10 Excel Series, subject to the equipment manufacturer's requirements.
Mobil DTE 24 Ultra vs. Mobil DTE 24
Mobil DTE 24 Ultra is the newer high-performance ISO VG 32 product in the DTE 20 Ultra family.
Mobil states that DTE 20 Ultra products can replace corresponding legacy DTE 20 Series products in compatible viscosity grades.
Mobil DTE 24 Ultra corresponds to legacy Mobil DTE 24.
Mobil also states that the two products are compatible if mixed during a transition. For best performance, Mobil recommends draining the previous product before filling with DTE 24 Ultra.
Current Approvals
- Bosch Rexroth Fluid Rating List 90245
- Denison HF-0
- Denison HF-1
- Denison HF-2
- Eaton E-FDGN-TB002-E
- HOCNF Norway-NEMS, Black
Recommended for Applications Requiring
Meets or Exceeds
- ASTM D6158 Class HMHP
- China GB 11118.1-2011 L-HM General
- China GB 11118.1-2011 L-HM High Pressure
- DIN 51524-2:2017-06
- ISO L-HM, ISO 11158:2023
- JCMAS HK VG32
Typical Technical Properties
| Property |
Typical Value |
| ISO Viscosity Grade |
32 |
| Density at 15.6°C |
0.8596 kg/L |
| Kinematic Viscosity at 40°C |
33.4 mm²/s |
| Kinematic Viscosity at 100°C |
5.8 mm²/s |
| Viscosity Index |
115 |
| Pour Point |
-36°C |
| Flash Point, COC |
231°C |
| FZG Scuffing Fail Load Stage |
11 |
| Copper Strip Corrosion |
1A |
| Rust Characteristics, Procedure B |
Pass |
| Emulsion, Time to 3 mL at 54°C |
20 min |
| Total Acid Number |
0.7 mg KOH/g |
| Foam Sequences I / II / III |
10/0 ml each |
Typical properties represent normal production values and should not be treated as guaranteed batch specifications.
Frequently Asked Questions
What is Mobil DTE 24 Ultra?
Mobil DTE 24 Ultra is a high-performance ISO VG 32 antiwear hydraulic oil designed for high-pressure industrial hydraulic systems.
What viscosity is Mobil DTE 24 Ultra?
Mobil DTE 24 Ultra is ISO VG 32. Typical kinematic viscosity is 33.4 mm²/s at 40°C and 5.8 mm²/s at 100°C.
Is Mobil DTE 24 Ultra the same as Mobil DTE 24?
Mobil DTE 24 Ultra is the newer corresponding ISO VG 32 product in the DTE 20 Ultra family. Mobil states that the Ultra product can replace legacy Mobil DTE 24 in compatible applications.
Can Mobil DTE 24 Ultra be mixed with Mobil DTE 24?
Mobil states that DTE 20 Ultra products are compatible with the corresponding legacy DTE 20 products. For maximum performance, Mobil recommends draining the old fluid before converting to DTE 24 Ultra.
Is Mobil DTE 24 Ultra zinc-free?
No. Mobil DTE 20 Ultra products contain zinc. Applications requiring zinc-free hydraulic oil should use a suitable zinc-free product that meets the equipment manufacturer's requirements.
Is Mobil DTE 24 Ultra an antiwear hydraulic oil?
Yes. It is specifically formulated as a high-performance antiwear hydraulic oil.
Is Mobil DTE 24 Ultra good for high-pressure hydraulic systems?
Yes. High-pressure and high-output hydraulic systems are among its primary intended applications.
Can Mobil DTE 24 Ultra be used in CNC machines?
Yes. Mobil specifically identifies numerically controlled machine tools and systems using close-clearance servo valves among its intended applications.
Does Mobil DTE 24 Ultra help prevent hydraulic deposits?
Yes. Keep-clean performance and deposit control are major features of the DTE 20 Ultra Series.
Does Mobil DTE 24 Ultra last longer than standard hydraulic oil?
Mobil reports up to 2X longer drain intervals compared with qualifying competitive hydraulic oils under its stated comparison conditions. Actual drain intervals depend on equipment and operating conditions.
Is Mobil DTE 24 Ultra approved by Bosch Rexroth?
Yes. Mobil currently lists Bosch Rexroth Fluid Rating List 90245 among its approvals.
Does Mobil DTE 24 Ultra have Denison approval?
Yes. The product carries Denison HF-0, HF-1 and HF-2 approvals.
Is Mobil DTE 24 Ultra approved by Eaton?
Yes. Eaton E-FDGN-TB002-E is listed as an approval.
Does Mobil DTE 24 Ultra meet Cincinnati P-68?
Mobil recommends DTE 24 Ultra for applications requiring Fives Cincinnati P-68.
Does Mobil DTE 24 Ultra meet DIN 51524-2?
Yes. Mobil currently lists DIN 51524-2:2017-06 among the requirements met or exceeded.
Does Mobil DTE 24 Ultra meet ISO 11158?
Yes. Current Mobil information lists ISO L-HM under ISO 11158:2023.
What is the pour point of Mobil DTE 24 Ultra?
The typical pour point is -36°C.
What is the flash point of Mobil DTE 24 Ultra?
The typical Cleveland Open Cup flash point is 231°C.
What is the viscosity index of Mobil DTE 24 Ultra?
The typical viscosity index is 115.
Can Mobil DTE 24 Ultra handle water contamination?
The fluid has controlled demulsibility and is intended for systems where small amounts of water may be unavoidable. Significant water contamination should still be corrected and removed.
Can Mobil DTE 24 Ultra be used in hydraulic systems with gears and bearings?
Yes. Mobil specifically includes hydraulic systems containing gears and bearings among the applications for the DTE 20 Ultra Series.
Is Mobil DTE 24 Ultra a gear oil?
No. It is an antiwear hydraulic oil. Its use in systems containing gears does not make it a substitute for dedicated industrial gear oil where gear oil is specified.
How often should Mobil DTE 24 Ultra be changed?
Follow the equipment manufacturer's recommendations and use oil condition monitoring when considering extended drain intervals. Mobil's up-to-2X oil-life result is comparative test performance, not a universal drain schedule.
