Mobil™ HyJet™ V

Aircraft component of hydraulic system

The first Type V phosphate ester hydraulic fluid to be used in service on Airbus and Boeing aircraft, Mobil HyJet V has logged more than 10 million in-service hours in more than 2,500 aircraft since its introduction in 2008.

Compatible with all approved Type IV and Type V hydraulic fluids, elastomers and other hydraulic system materials, Mobil HyJet V is a fire-resistant phosphate ester hydraulic fluid that can help mixed fleets extend the life of hydraulic systems.

Mobil HyJet V is fully approved in all commercial 5000 psi hydraulic pressure aircraft systems. Reasons to trust in Mobil HyJet V

Reasons to trust in Mobil HyJet V

  1. Mobil HyJet V offers more than twice the shelf life of Type IV fluids, helping operators extend fluid life.
  2. It helps reduce fuel consumption and costs with its low-density formulation.
  3. Helps maximize component life and reduce maintenance costs with its exceptional protection against wear, corrosion, erosion and deposit control.
  4. Gives operators a high measure of safety and confidence with its exceptional resistance to flammability, which exceeds Grade A flash point specifications of air framers such as Airbus and Boeing.
  5. Maintains outstanding performance, stability and viscosity in a wide range of temperatures. 

Product information

Data sheets

Technical Resources

Features and Benefits

Mobil HyJet V offers the following key features and benefits:

Features Advantages and Potential Benefits
Higher stability than Type IV fluids Longer fluid life, Lesser need to replace fluid due to degradation, Reduced hydraulic system maintenance costs
Meets Boeing BMS 3-11 and SAE AS1241 Type IV and Type V requirements Improved flammability characteristics over meeting just the Type V requirements
Low density Reduced weight of the hydraulic fluid carried by aircraft, Reduced aircraft fuel consumption, Lower operating costs
Excellent rust protection Reduced risk of equipment damage in the event of major water contamination
Excellent low and high temperature viscosity balance Precise hydraulic system control and response even during extended range/polar flights, Longer aircraft hydraulic system equipment life
Excellent deposit control Longer aircraft hydraulic system equipment life, Reduced maintenance costs
Improved protection against electro-chemical corrosion (erosion) Protection against servo valve and pump damage
Fully compatible with all approved Type IV and Type V phosphate ester hydraulic fluids Flexibility in use by airline operators


Mobil HyJet V is designed for use in commercial aircraft phosphate ester hydraulic systems. It meets the SAE AS1241 requirements and is included in commercial and business airframe manufacturer Qualified Products Lists, as shown below. It is compatible in all proportions with commercial Type IV and Type V phosphate ester aviation hydraulic fluids.

Specifications and Approvals

Mobil HyJet V Meets Is In Qualified Products List
Airbus (NSA 307110N Type V) X X
ATR (NSA307110N Type V) X X
Boeing (All fleets including B787) X X
Boeing (BMS 3-11P Type V, Grade A & C) X X
Boeing-Long Beach (DMS 2014H Type 5) X X
Bombardier (C Series) X X
Ebraer X X
Fokker (SL050) X X
Gulfstream (1159SCH302J Type V) X X
SAE Aerospace Standard (AS1241D) X X
SAE Aerospace Standard (AS1241 Type V) X Not Applicable

Properties and Specifications

Acid Number, mgKOH/g, ASTM D974 0.04
Autoignition Temperature, F, ASTM D2155 >427 (800)
Bulk Modulus, Isothermal secant at 100 F/3000 psi, psi, ASTM D6793 210000
Calcium, ppm, ICPES 4
Chlorine, ppm, XRF 10
Coefficient of Thermal Expansion, 25 to 100 C, per degree C, API MPMS 11.1 0.00086 (0.00048)
Conductivity @ 20 C, MicS/cm, ASTM D2624 0.4
Density @ 60 F, lb/USg, ASTM D4052 1.000 (8.35)
Fire Point, Cleveland Open Cup, °F, ASTM D92 186 (366)
Flash Point, Cleveland Open Cup, °F, ASTM D92 174 (346)
Foam, Sequence I, Collapse Time, s, ASTM D892 32/18
Foam, Sequence II, Collapse Time, s, ASTM D892 23/13
Foam, Sequence III, Collapse Time, s, ASTM D892 34/19
Four-Ball Wear Test, Scar Diameter, 10 kg, 600 rpm, 1 h, 75 C, mm, ASTM D4172 (mod) 0.26
Four-Ball Wear Test, Scar Diameter, 4 kg, 600 rpm, 1 h, 75 C, mm, ASTM D4172 (mod) 0.21
Four-Ball Wear Test, Scar Diameter, 40 kg, 600 rpm, 1 h, 75 C, mm, ASTM D4172 (mod) 0.63
Kinematic Viscosity @ 100 F, mm2/s, ASTM D445 10.6
Kinematic Viscosity @ 127.6 C, mm2/s, ASTM D445 2.6
Kinematic Viscosity @ -15 F, mm2/s, ASTM D445 132
Kinematic Viscosity @ 210 F, mm2/s, ASTM D445 3.6
Kinematic Viscosity @ -65 F, mm2/s, ASTM D445 1350
Potassium, ppm, ICPES/AA 38
Shear Stability, % Kinematic Viscosity Loss, 40 C, %, ASTM D5621 21
Sodium, ppm, ICPES 1
Specific Gravity, 25 C/25 C, ASTM D4052 0.997
Specific Heat Capacity, cal/g-deg.C, Reference 0.42
Sulfur, ppm, ICPES/XRF 51
Thermal Conductivity at 40 C, cal/cm-sec-deg.C, Reference 33x10^-5 (0.0799)
Viscosity Index, ASTM D2270 280
Water Content, mass%, ASTM D6304 0.09
Pour Point, °F, ASTM D97 / ASTM D5950 -80
NAS 1638 Class, HIAC, ISO 11500 7

Health and safety

Health and Safety recommendations for this product can be found on the Material Safety Data Sheet (MSDS)

  • Airbus
  • Boeing
  • Bombardier - Cseries
  • COMAC (Commercial Aircraft Corporation of China)
  • Fokker
  • Gulfstream
  • Maximize component life
  • Extended fluid life
  • Low density
  • Rust protection
  • Extended temperature range
  • Deposit control
  • Erosion protection
  • Corrosion protection
  • Fire-resistance
  • SAE AS1241
  • Airbus / ATR NSA 307110N
  • Boeing BMS 3-11P Type V, Grade A and Grade C
  • Boeing-Long Beach DMS 2014H Type 5
  • Gulfstream 1159SCH302J
  • Fokker (SL050)
  • Type V
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