Significance and Use
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.
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 D 7320) engine tests, respectively.
This bench test procedure has potential use in specifications and classifications of engine lubricating oils, such as Specification D 4485.
1. Scope
1.1 This test method describes a bench procedure to simulate the oil aging encountered in Test Method D 7320, 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 D 7320.
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 |
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, Petroleum Products, 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 -5 and -35C Using Cold-Cranking Simulator
D7320 Test Method for Evaluation of Automotive Engine Oils in the Sequence IIIG, Spark-Ignition Engine
SAE Standard
SAEJ300 Engine Oil Viscosity Classification
Keywords
evaporative loss; low-temperature pumpability; MRV viscosity; oil aging; oil oxidation; oil viscosity; ROBO test; sequence IIIG test; sequence IIIGA test; volatiles;
ICS Code
ICS Number Code 75.100 (Lubricants, industrial oils and related products)
DOI: 10.1520/D7528-09
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Citing ASTM Standards
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