Standard Active Last Updated: Apr 27, 2022 Track Document
ASTM D7528-22

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

Standard Test Method for Bench Oxidation of Engine Oils by ROBO Apparatus D7528-22 ASTM|D7528-22|en-US Standard Test Method for Bench Oxidation of Engine Oils by ROBO Apparatus Standard new BOS Vol. 05.04 Committee D02
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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.


1.1 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

Dilute Nitrogen Dioxide in Air Option Information

Appendix X6

Time-Averaged Subsurface Air Flow Rate

Appendix X7

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.

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Book of Standards Volume: 05.04
Developed by Subcommittee: D02.B0.07
Pages: 25
DOI: 10.1520/D7528-22
ICS Code: 75.100