Lubricant test methods are standardised laboratory procedures used to measure defined physical and chemical properties of oils and greases. These methods are referenced throughout technical data sheets, standards, and specifications to indicate how reported values are obtained.
This page provides reference guidance on commonly cited lubricant test methods, explaining what each method measures and how results are used when interpreting specifications and comparing documented performance data.
Test methods describe measured properties under controlled conditions. They do not define application suitability, service life, or overall lubricant performance in isolation.
Purpose of lubricant test methods
Test methods establish consistent procedures for measuring lubricant properties, including sample preparation, test conditions, equipment requirements, and calculation methods.
By referencing a defined test method, technical documentation allows measured values to be compared consistently across products, laboratories, and specifications.
How test methods appear in specifications
Test method references typically appear alongside reported property values in technical data sheets, approval documents, and standards references.
Specifications may require that a property is measured using a specific test method to ensure consistency when comparing data or assessing compliance.
Common lubricant properties measured
- Viscosity and viscosity temperature behaviour
- Low temperature flow characteristics
- Flash point and volatility indicators
- Foaming tendency and air release behaviour
- Water separation and corrosion protection
Frequently referenced ASTM test methods
ASTM D445
Measures kinematic viscosity at specified temperatures, commonly 40°C and 100°C.
ASTM D2270
Calculates viscosity index based on viscosity measurements.
ASTM D92
Determines flash point using the Cleveland Open Cup method.
ASTM D97
Determines pour point, indicating low temperature flow behaviour.
ASTM D892
Evaluates foaming characteristics, including foam tendency and stability.
ASTM D1401
Assesses water separability and demulsibility characteristics.
ASTM D665
Evaluates rust prevention performance in the presence of water.