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    ASTM D7528 - 21

    Standard Test Method for Bench Oxidation of Engine Oils by ROBO Apparatus

    Active Standard ASTM D7528 | Developed by Subcommittee: D02.B0.07

    Book of Standards Volume: 05.04

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    Significance and Use

    5.1 This bench test method is intended to produce comparable oil aging characteristics to those obtained with ASTM TMC Sequence IIIGA matrix reference oils 434, 435, and 438 after aging in the Sequence IIIG engine test.

    5.2 To the extent that the method generates aged oils comparable to those from the Sequence IIIG engine test, the measured increases in kinematic and MRV viscosity indicate the tendency of an oil to thicken because of volatilization and oxidation, as in the Sequence IIIG and IIIGA (see Appendix X1 in Test Method D7320) engine tests, respectively.

    5.3 This bench test procedure has potential use in specifications and classifications of engine lubricating oils, such as Specification D4485.

    5.4 The results of this test method are valid when seeking qualification of oils against published specifications only when run on a test stand that has successfully met the calibration requirements specified under the TMC’s ROBO test monitoring program.

    1. Scope

    1.1 This test method describes a bench procedure to simulate the oil aging encountered in Test Method D7320, the Sequence IIIG engine test method. These aged oils are then tested for kinematic viscosity and for low-temperature pumpability properties as described in the Sequence IIIGA engine test, Appendix X1 of Test Method D7320.

    1.2 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

    1.2.1 Exceptions—There are no SI equivalents for some apparatus in Section 6, and there are some figures where inch units are to be regarded as standard.

    1.3 This test method is arranged as follows:





    Reference Documents




    Summary of Test Method


    Significance and Use




    Reagents and Materials




    New and Existing Test Stand Calibration






    Calculations and Determination of Test Results




    Precision and Bias






    ASTM Test Monitoring Center: Organization

    Annex A1

    ASTM Test Monitoring Center: Calibration Procedures

    Annex A2

    ASTM Test Monitoring Center: Maintenance Activities

    Annex A3

    ASTM Test Monitoring Center: Related Information

    Annex A4

    Reaction Vessel

    Annex A5

    Reaction Vessel Head

    Annex A6

    Reaction Vessel-to-Head Seal

    Annex A7

    Agitator Turbine Blade

    Annex A8

    Agitator Packing Gland

    Annex A9

    Nitrogen Dioxide Graduated Tube

    Annex A10

    Vacuum System Plumbing

    Annex A11

    Vacuum Trap Condensers

    Annex A12

    Setting the Vacuum Control Valve

    Annex A13



    Sample Preparation and Addition

    Appendix X1

    Charging the Liquid Nitrogen Dioxide

    Appendix X2

    Nitrogen Dioxide Precision Needle Valve

    Appendix X3

    Example of an Assembled ROBO Apparatus

    Appendix X4

    Information Package to Aid Setting Up a New Robo Apparatus

    Appendix X5

    1.4 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. Specific warning statements are given in Sections 7 and 8.

    1.5 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)

    D4175 Terminology Relating to Petroleum Products, Liquid Fuels, and Lubricants

    D4485 Specification for Performance of Active API Service Category Engine Oils

    D4684 Test Method for Determination of Yield Stress and Apparent Viscosity of Engine Oils at Low Temperature

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

    D7320 Test Method for Evaluation of Automotive Engine Oils in the Sequence IIIG, Spark-Ignition Engine

    SAE Standard

    SAE J300

    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/D7528-21

    Citation Format

    ASTM D7528-21, Standard Test Method for Bench Oxidation of Engine Oils by ROBO Apparatus, ASTM International, West Conshohocken, PA, 2021, www.astm.org

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