ASTO 308

A 3 mm²/s synthetic ester oil with additives targeted at oxidation and corrosion resistance, and wear reduction. It offers dependability for older engines that require a MIL-PRF-7808 oil.

Specifications & approvals

Country Specification
United States MIL-PRF-7808M Grade 3
NATO Code O-148
Joint Service Designation OX-9

 

Download TDS (PDF)
Download MSDS (UK)

The TDS and MSDS are in English, but you can find these documents for other countries in the Shell EPC area
.

Applications

AeroShell Turbine Oil 308 was developed specifically for use in particular models of aircraft prop and turbojet engines for which a MIL-PRF-7808 (formerly MIL-L-7808) oil is required.

AeroShell Turbine Oil 308 contains a synthetic ester oil and should not be used in contact with incompatible seal, and it also affects some paints and plastics.

  • Health, Safety and Environment

    Health and Safety

    • This product is unlikely to present any significant health or safety hazard when properly used in the recommended application and good standards of personal hygiene are maintained.
    • Avoid contact with skin. Use impervious gloves with used oil. After skin contact, wash immediately with soap and water.
    • Guidance on Health and Safety is available on the appropriate Safety Data Sheet, which can be obtained from https://www.epc.shell.com/

    Protect the Environment

    • Take used oil to an authorised collection point. Do not discharge into drains, soil or water.

Additional information

Advice

  • Advice on applications not covered here may be obtained from your Shell representative.

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Typical Physical Characteristics

Properties Method MIL-PRF-7808M Grade 3 Typical
Oil type – Synthetic ester Synthetic ester
Kinematic Viscosity @100°C mm²/s ASTM D445 3.0 min 3.1
Kinematic Viscosity @40°C mm²/s ASTM D445 11.5 min 12
Kinematic Viscosity @-51°C mm²/s ASTM D2532 13 000 max 7 600
Flash Point °C ASTM D92 210 min 225
Total Acidity mgKOH/g ASTM D664 0.40 max 0.27
Trace metal content – Must pass Passes
Foaming tendency ASTM D892 Must pass Passes
Evaporation loss (6.5 hrs) @205°C %m ASTM D972 30 max 28
Corrosion test – Silver @232°C g/m² FED-STD-791 M.5305 +/- 4.5 max 0.01
Corrosion test – Bronze @232°C g/m² FED-STD-791 M.5305 +/- 4.5 max 0.09
Deposition Test WADC – deposit rating FED-STD-791 M.5003 1.5 max 0.8
Deposition Test WADC – acid number change, % FED-STD-791 M.5003 20 max 2
Deposition Test WADC – viscosity change @40°C, % FED-STD-791 M.5003 100 max 12
Elastomer compatibility SAE AMS 3217/1, 168 hrs @70°C, % swell FED-STD-791 M.3604 12 to 35 32
Elastomer compatibility SAE AMS 3217/4, 72 hrs @175°C, % swell FED-STD-791 M.3432 2 to 25 16
Elastomer compatibility SAE AMS 3217/4, 72 hrs, tensile strength change @175°C, % FED-STD-791 M.3432 50 max -18
Elastomer compatibility SAE AMS 3217/4, 72 hrs, elongation change @175°C, % FED-STD-791 M.3432 50 max -16
Elastomer compatibility SAE AMS 3217/4, 72 hrs, hardness change @175°C, % FED-STD-791 M.3432 20 max -8
Elastomer compatibility SAE AMS 3217/5, 72 hrs @150°C, % swell FED-STD-791 M.3432 2 to 25 9
Elastomer compatibility SAE AMS 3217/5, 72 hrs, tensile strength change @150°C, % FED-STD-791 M.3432 50 max -9
Elastomer compatibility SAE AMS 3217/5, 72 hrs, elongation change @150°C, % FED-STD-791 M.3432 50 max -27
Elastomer compatibility SAE AMS 3217/5, 72 hrs, hardness change @150°C, % FED-STD-791 M.3432 20 max -5
Lead Corrosion FED-STD-791 M.5321 9.3 max 0.2
Corrosion and Oxidation Stability 96h @ 200°C ASTM D4636 Must pass Passes
Gravimetric particulate contamination FED-STD-791 M.3013 Must pass Passes
Gear load carrying capacity FED-STD-791 FTM 6508 Must pass Passes

 

These characteristics are typical of current production. Whilst future production will conform to Shell’s specification, variations in these characteristics may occur.

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