MIL-PRF-23699 is the U.S. military performance specification for inhibited, synthetic hydrocarbon-base turbine engine lubricants. Oils qualified to this specification are 5 mm²/s synthetic hindered ester fluids formulated with additives to improve thermal and oxidation stability and metal passivation. AeroShell Turbine Oil 500, one of the most widely approved products under this specification, was developed to meet the requirements of Pratt & Whitney 521 Type II and MIL-PRF-23699 and is approved as an SAE AS5780B Grade SPC (Standard Performance Capability) oil. These oils are not compatible with all seal materials and should not be used in contact with incompatible elastomers; refer to manufacturer guidance before use.
MIL-PRF-23699 as a Turbine Engine Lubricant
MIL-PRF-23699 All-Properties Calculator
Degrees (°F):
Degrees (°C):
Density
Density (kg/m³):
Density (lb/gal):
Density (lb/ft³):
Specific Gravity:*
Viscosity
Kinematic Viscosity (mm²/s):
Kinematic Viscosity (SSU):
Dynamic Viscosity (mPa·s):
Dynamic Viscosity (lb/(ft·s)):
Thermal Properties
Specific Heat (kJ/kg·K):
Specific Heat (BTU/(lb·°F)):
Thermal Conductivity (W/m·K):
Thermal Conductivity (BTU/(hr·ft·°F)):
Thermal Conductivity (BTU·in/(hr·ft²·°F)):
Thermal Diffusivity (×10⁻⁸ m²/s):
Prandtl Number:
Thermal Expansion
β × 10⁻⁴ (1/K):
% Vol. Change from 20°C:
*Specific gravity is referenced to a static water density of 998 kg/m³ (water at 60 °F) rather than to water at the fluid's own temperature.
Combines the Density, Viscosity, Specific Heat, Thermal Conductivity, Thermal Diffusivity, Prandtl Number, and Thermal Expansion calculators into one oil + temperature lookup. Density, specific heat, thermal conductivity, and thermal expansion are shared across all six oils (all qualify to the same base-fluid spec); only kinematic viscosity is oil-specific, per NIST IR 8263. Dynamic viscosity and Prandtl number use a separately measured generic MIL-PRF-23699 dataset (Table B4, valid 62–260 °F / 17–127 °C), independent of the oil selector.
Specifications
| Authority | Designation |
|---|---|
| U.S. | Approved MIL-PRF-23699G Grade STD Approved SAE AS5780B Grade SPC |
| British | Approved DEF STAN 91-101 Grade OX-27 |
| French | Equivalent DCSEA 299/A |
| Russian | — |
| NATO Code | O-156 |
| Joint Service Designation | OX-27 |
| Pratt & Whitney | Approved 521C Type II |
| General Electric | Approved D-50 TF 1 |
| Allison | Approved EMS-53 (Obsolete) |
Common Qualified Products
| Product | Specification | Specifications and approvals listed on the current data sheet | Notes |
|---|---|---|---|
| AeroShell Turbine Oil 500 | MIL-PRF-23699G Grade STD; SAE AS5780D SPC | MIL-PRF-23699G Grade STD; SAE AS5780D Grade SPC; DEF STAN 91-101 (British); DCSEA 299/A (French) equivalent; NATO Code O-156; Joint Service Designation OX-27; Pratt & Whitney 521C Type II; General Electric D-50 TF 1; Allison EMS-53 (obsolete) | Standard 5 mm²/s synthetic hindered-ester turbine oil. Data sheet |
| AeroShell Turbine Oil 560 | MIL-PRF-23699G Grade HTS; SAE AS5780D SPC | MIL-PRF-23699G Grade HTS; SAE AS5780D Grade SPC; DEF STAN 91-101 (British) equivalent; COMAC QPL-CMS-OL-202; DCSEA 299/A (French) equivalent; VNII NP 50-1-4F, B3V, LZ-240, VNII NP 50-1-4U and 36/Ku-A (Russian) analogue; NATO Code O-154; Joint Service Designation OX-27 equivalent; Pratt & Whitney 521C Type II; General Electric D-50 TF 1; Allison EMS-53 (obsolete) | High thermal stability 5 mm²/s synthetic ester turbine oil. Data sheet |
| AeroShell Ascender | MIL-PRF-23699G Grade HTS; SAE AS5780D HPC | SAE AS5780D Grade HPC; MIL-PRF-23699G Grade HTS; DEF STAN 91-101 (British) equivalent; DCSEA 299/A (French) equivalent; NATO Code O-154; Joint Service Designation OX-27 equivalent; Pratt & Whitney 521C Type II; General Electric D-50 TF 1 | High performance capability (HPC) 5 mm²/s synthetic ester turbine oil. Data sheet |
| AeroShell Turbine Oil 555 | DOD-PRF-85734A (not MIL-PRF-23699) | DOD-PRF-85734A; DEF STAN 91-100 (British); NATO Code O-160; Joint Service Designation OX-26; Pratt & Whitney 521C Type II; General Electric D-50 TF 1; Allison EMS-53 (obsolete) | Not a MIL-PRF-23699 oil: 5 mm²/s oil for high-load helicopter engines and transmissions. Data sheet |
| AeroShell Turbine Oil 750 | DEF STAN 91-98 (not MIL-PRF-23699) | DEF STAN 91-98; French: Equivalent AIR 3517A; Russia: Analogue TU 38.1011722-85 Grade MN-7.5u; NATO Code O-149 (equivalent O-159); Joint Service Designation OX-38 | Not a MIL-PRF-23699 oil: 7.5 mm²/s synthetic ester turbine oil. Data sheet |
| AeroShell Turbine Oil 308 | MIL-PRF-7808M Grade 3 (not MIL-PRF-23699) | MIL-PRF-7808M Grade 3; NATO Code O-148; Joint Service Designation OX-9 | Not a MIL-PRF-23699 oil: 3 mm²/s synthetic ester turbine oil (MIL-PRF-7808). It is not a hydraulic fluid. Data sheet |
| AeroShell Turbine Oil 390 | DEF STAN 91-94 (not MIL-PRF-23699) | DEF STAN 91-94; Russia: analogue to IPM-10, VNII NP 50-1 4f and 4u, and 36Ku-A; Joint Service Designation OX-7 | Not a MIL-PRF-23699 oil: 3 mm²/s synthetic diester turbine oil. Data sheet |
| AeroShell Turbine Oil 3 | DEF STAN 91-99 (not MIL-PRF-23699) | DEF STAN 91-99; French: AIR 3515/B; Russia: MK-8; NATO Code O-135 and O-134; Joint Service Designation OM-11 and OM-13; DEF STAN 91-44 | Not a MIL-PRF-23699 oil: 3 mm²/s mineral turbine oil. Data sheet |
Properties — MIL-PRF-23699G Grade STD / SAE AS5780B Grade SPC
| Property | Specification | Typical |
|---|---|---|
| Oil type | Synthetic ester | Synthetic ester |
| Kinematic viscosity mm²/s — @ 100 °C | 4.90 to 5.40 | 5.17 |
| Kinematic viscosity mm²/s — @ 40 °C | 23.0 min | 25.26 |
| Kinematic viscosity mm²/s — @ −40 °C | 13000 max | 8996 |
| Flashpoint — Cleveland Open Cup (°C) | 246 min | 256 |
| Pourpoint (°C) | −54 max | <−54 |
| Total acidity (mgKOH/g) | 1 max | 0.11 |
| Evaporation loss — 6.5 hrs @ 204 °C (%m) | 10.0 max | 3.6 |
| Foaming | Must pass | Passes |
| Swelling of standard synthetic rubber SAE-AMS 3217/4, 72 hrs @ 204 °C (swell %) | 5 to 25 | Within limits (15%) |
| Elastomer compatibility — % weight change after 24/120 hrs: Fluorocarbon @ 200 °C | 10/15 max. | Within limits |
| Elastomer compatibility — LCS Fluorocarbon @ 200 °C | 10/20 max. | Within limits |
| Elastomer compatibility — Nitrile @ 130 °C | Report | Within limits |
| Elastomer compatibility — Silicone @ 175 °C | Report | Within limits |
| Elastomer compatibility — Perfluoroelastomer @ 200 °C | N/A | — |
| Thermal stability/corrosivity 96 hrs @ 274 °C — metal weight change (mg/cm) | 4 max | 0.5 |
| Thermal stability/corrosivity — viscosity change (%) | 5 max | 2.69 |
| Thermal stability/corrosivity — total acid number change (mgKOH/g) | 6 max | 2.03 |
| Corrosion & oxidation stability — 72 hrs @ 175 °C | Must pass | Passes |
| Corrosion & oxidation stability — 72 hrs @ 204 °C | Must pass | Passes |
| Corrosion & oxidation stability — 72 hrs @ 218 °C | Must pass | Passes |
| HLPS dynamic coking @ 375 °C, 20 hrs — deposit (mg) | Report | 1.34 average |
| Ryder gear test, relative rating (%) — Hercolube A | 102 | 117 |
| Bearing Test Rig Type 1 ½, 100 hrs — overall deposit demerit rating | 80.0 max | 51 |
| Bearing Test Rig — viscosity change @ 40 °C (%) | −5 to +30 | 18.25 |
| Bearing Test Rig — total acid number change (mgKOH/g) | 2 max | 0.63 |
| Bearing Test Rig — filter deposits (g) | 3 max | 0.70 |
| Sonic shear stability — viscosity change @ 40 °C (%) | 4 max | 0.19 |
| Trace metal content | Must pass | Passes |
| Sediment (mg/l) | 10 max | 0.77 |
| Ash (mg/l) | 1 max | 0.4 |
Equipment Manufacturer Approvals
AeroShell Turbine Oil 500 is approved for use in all models of the following engines:
| Manufacturer | Approved Engines / Models |
|---|---|
| Honeywell | TPE 331, GTCP 30, 36, 85, 331, 660 and 700 series APUs. ALF 502, LF507, LTS101, LTP101, T53, T55, AL5512, RE100, TCSP700, RE200 |
| Allison (Rolls-Royce) | 250 Series, 501, D13, T56, GMA 2100, GMA 3007 |
| BMW-Rolls-Royce | BR710, BR715 |
| Engine Alliance | GP7200 |
| Eurojet | EJ200 |
| GE | CF6, CT58, CF700, CJ610, CJ805, CF34, CT7, CT64 |
| Hamilton Sundstrand | APS 500, 100, 2000, 3000 |
| IAE | — |
| Motorlet | M601D, E and Z |
| Pratt & Whitney | JT3, JT4, JT8, JT9, JT12, PW4000, PW6000 |
| Pratt & Whitney Canada | JT15, PT6A, PT6T, ST6, PW100, PW200, PW300, PW500 |
| Rolls-Royce | RB211, -524, -535, Tay, Gnome, Spey, RB183, Adour, M45H, Viper (Series MK 301, 521, 522, 526, 535, 540, 601, 623 and 632) |
| Turbomeca | Adour, Ardiden, Arriel, Arrius, Arrius 1D, AST 600, Astazou XVI, Larzac, Makila, MTR390, RTM322, TM333, 526, 535, 540, 601, 623 and 632. Approved with restrictions*: Artouste, AST 950, Astazou, Turmo, Bastan |
MIL-PRF-23699 Property Calculators
Explore the full set of MIL-PRF-23699 property calculators on KasperCalc: