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.

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 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 and health practices and determine the applicability of regulatory limitations prior to use. Specific warning statements are given in Sections 7 and 8.

1.4 This test method is arranged as follows:

Section

Scope

1

Reference Documents

2

Terminology

3

Summary of Test Method

4

Significance and Use

5

Apparatus

6

Reagents and Materials

7

Hazards

8

Reference Oil Testing and Test Stand Calibration

9

Procedure

10

Cleaning

11

Calculations and Determination of Test Results

12

Report

13

Precision and Bias

14

Keywords

15

Annexes

Reaction Vessel

Annex A1

Reaction Vessel Head

Annex A2

Reaction Vessel-to-Head Seal

Annex A3

Agitator Turbine Blade

Annex A4

Agitator Packing Gland

Annex A5

Nitrogen Dioxide Graduated Tube

Annex A6

Vacuum System Plumbing

Annex A7

Vacuum Trap Condensers

Annex A8

Setting the Vacuum Control Valve

Annex A9

Appendixes

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