ASTM D8185 - 18

    Standard Guide for In-Service Lubricant Viscosity Measurement

    Active Standard ASTM D8185 | Developed by Subcommittee: D02.96

    Book of Standards Volume: 05.05


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    1. Scope

    1.1 Significance and Determination of Viscosity—The purpose of this guide is to provide sufficient knowledge for a person with some technical background in lubrication or condition monitoring from which they can determine the best choice for measuring viscosity of an in-service oil. Such information from this guide should enable the user to engage in productive discussions with colleagues, service providers, managers, and service personnel about obtaining and using information on and from viscosity. There are a number of different approaches to viscometric measurement, and this guide is intended to be a helpful resource in selecting the most appropriate viscometric approach to gain information for the in-service fluid.

    1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

    1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

    1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D445 Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and Calculation of Dynamic Viscosity)

    D446 Specifications and Operating Instructions for Glass Capillary Kinematic Viscometers

    D2983 Test Method for Low-Temperature Viscosity of Automatic Transmission Fluids, Hydraulic Fluids, and Lubricants using a Rotational Viscometer

    D4057 Practice for Manual Sampling of Petroleum and Petroleum Products

    D4378 Practice for In-Service Monitoring of Mineral Turbine Oils for Steam, Gas, and Combined Cycle Turbines

    D4683 Test Method for Measuring Viscosity of New and Used Engine Oils at High Shear Rate and High Temperature by Tapered Bearing Simulator Viscometer at 150C

    D5133 Test Method for Low Temperature, Low Shear Rate, Viscosity/Temperature Dependence of Lubricating Oils Using a Temperature-Scanning Technique

    D5293 Test Method for Apparent Viscosity of Engine Oils and Base Stocks Between 10C and 35C Using Cold-Cranking Simulator

    D5478 Test Methods for Viscosity of Materials by a Falling Needle Viscometer

    D6224 Practice for In-Service Monitoring of Lubricating Oil for Auxiliary Power Plant Equipment

    D6299 Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measurement System Performance

    D6304 Test Method for Determination of Water in Petroleum Products, Lubricating Oils, and Additives by Coulometric Karl Fischer Titration

    D6616 Test Method for Measuring Viscosity at High Shear Rate by Tapered Bearing Simulator Viscometer at 100C

    D6896 Test Method for Determination of Yield Stress and Apparent Viscosity of Used Engine Oils at Low Temperature

    D7042 Test Method for Dynamic Viscosity and Density of Liquids by Stabinger Viscometer (and the Calculation of Kinematic Viscosity)

    D7110 Test Method for Determining the Viscosity-Temperature Relationship of Used and Soot-Containing Engine Oils at Low Temperatures

    D7279 Test Method for Kinematic Viscosity of Transparent and Opaque Liquids by Automated Houillon Viscometer

    D7483 Test Method for Determination of Dynamic Viscosity and Derived Kinematic Viscosity of Liquids by Oscillating Piston Viscometer

    D8092 Test Method for Field Determination of Kinematic Viscosity Using a Microchannel Viscometer

    SAE AIR Standard

    SAE AIR 5704 Field Viscosity Test for Thickened Aircraft Anti-icing Fluids


    ICS Code

    ICS Number Code 75.100 (Lubricants, industrial oils and related products)

    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/D8185-18

    Citation Format

    ASTM D8185-18, Standard Guide for In-Service Lubricant Viscosity Measurement, ASTM International, West Conshohocken, PA, 2018, www.astm.org

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