Fuel and Lubricant Testing


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MIL-PRF-23699G - Synthetic Base Aircraft Turbine Engine Lubricating Oil


We perform lubricants testing by military specification MIL-PRF-23699, which covers 4 classes of gas turbine engine lubricating oil used in aircraft engines. These lubricating oils have a nominal viscosity of 5 centistokes at 100C and are typically made with neopentyl polyol ester base stocks. These oils are identified by NATO Code Numbers O-156 (STD - Standard (Non-Corrosion Inhibiting)), O-152 (C/I - Corrosion Inhibiting), O-154 (HTS - High Thermal Stability), and O-167 (EE - Enhanced Ester).

These lubricating oils are intended for use in gas turbine engines and gear boxes for air, sea, and ground mobility equipment. These oils are designed for operation within the approximate bulk oil temperature range of -40C to 204C (-40F to 400F). The STD class oil is intended for use in normal performance turbo equipment where concerns about ferrous material (gears and bearings) corrosion induced from extended periods of downtime in a moist environment is not a concern. The C/I class oil is intended for applications where corrosion inhibition is desired. The HTS class is for use in hot running engine designs where evidence of oil coking and/or oil degradation is noted. The EE class is intended for applications needing improved fluorocarbon (SAE AMS7276) compatibility as well as better load carrying capability. All the lubricant classifications are not intended for use in gas turbine systems containing silicone and fluorosilicone seals which operate at elevated temperatures. All the lubricant classifications are interchangeable and fully compatible with each other; however, mixing across classifications will diminish the added benefits provided by the C/I, HTS or EE oils and the mixture will revert to the STD level of performance.

To read or download a copy of this specification, click HERE. We also perform testing according to Specification MIL-PRF-23699F; to learn more about that version of this specification, click HERE.

The following is a list of tests that we perform according to Specification MIL-PRF-23699G. To learn more about one of these tests, click on the test method number.