5.1 This test method is used to evaluate automotive engine oils for protection of engines against bearing weight loss.
5.2 This test method is also used to evaluate the SIG capabilities of multiviscosity-graded oils.
5.3 Correlation of test results with those obtained in automotive service has not been established.
5.4 Use—The Sequence VIII test method is useful for engine oil specification acceptance. It is used in specifications and classifications of engine lubricating oils, such as the following:
5.4.1 Specification D4485.
5.4.2 API Publication 1509 Engine Oil Licensing and Certification System.7
5.4.3 SAE Classification J304.
Область применения1.1 This test method covers the evaluation of automotive engine oils (SAE grades 0W, 5W, 10W, 20, 30, 40, and 50, and multi-viscosity grades) intended for use in spark-ignition gasoline engines. The test procedure is conducted using a carbureted, spark-ignition Cooperative Lubrication Research (CLR) Oil Test Engine (also referred to as the Sequence VIII test engine in this test method) run on unleaded fuel. An oil is evaluated for its ability to protect the engine and the oil from deterioration under high-temperature and severe service conditions. The test method can also be used to evaluate the viscosity stability of multi-viscosity-graded oils. Companion test methods used to evaluate engine oil performance for specification requirements are discussed in the latest revision of Specification D4485.
1.2 Correlation of test results with those obtained in automotive service has not been established. Furthermore, the results obtained in this test are not necessarily indicative of results that will be obtained in a full-scale automotive spark-ignition or compression-ignition engine, or in an engine operated under conditions different from those of the test. The test can be used to compare one oil with another.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3.1 Exceptions—The values stated in inch-pounds for certain tube measurements, screw thread specifications, and sole source supply equipment are to be regarded as standard.
1.3.1.1 The bearing wear in the text is measured in grams and described as weight loss, a non-SI term.
1.4 This test method is arranged as follows:
Subject
Section
Introduction
Scope
1
Referenced Documents
2
Terminology
3
Summary of Test Method
4
Before Test Starts
4.1
Power Section Installation
4.2
Engine Operation (Break-in)
4.3
Engine Operation (Test/Samples)
4.4
Stripped Viscosity
4.5
Test Completion (BWL)
4.6
Significance and Use
5
Evaluation of Automotive oils
5.1
Stay in Grade Capabilities
5.2
Correlation of Results
5.3
Use
5.4
Apparatus
6
Test Engineering, Inc.
6.1
Fabricated or Specially Prepared Items
6.2
Instruments and Controls
6.3
Procurement of Parts
6.4
Reagents and Materials
7
Reagents
7.1
Cleaning Materials
7.2
Expendable Power Section-Related Items
7.3
Power Section Coolant
7.4
Reference Oils
7.5
Test Fuel
7.6
Test Oil Sample Requirements
8
Selection
8.1
Inspection
8.2
Quantity
8.3
Preparation of Apparatus
9
Test Stand Preparation
9.1
Conditioning Test Run on Power Section
9.2
General Power Section Rebuild Instructions
9.3
Reconditioning of Power Section After Each Test
9.4
Calibration
10
Power Section and Test Stand Calibration
10.1
Instrumentation Calibration
10.2
Calibration of AFR Measurement Equipment
10.3
Calibration of Torque Wrenches
10.4
Engine Operating Procedure
11
Run-In and Flush
11.1
Test Operating Conditions
11.2
Air-Fuel Ratio and Spark Advance
11.3
Air, Off-Gas and Blowby Measurement
11.4
Unscheduled Shutdowns
11.5
Oil Sampling and Oil Addition
11.6
Periodic Measurements
11.7
Final Oil Drain and Oil Consumption Computation
11.8
Operational Validity Criteria
11.9
Test Completion
11.10
Determination of Test Results
12
Oil Analysis
12.1
Test Bearing Weight Loss Determination
12.2
Report
13
Precision and Bias
14
Precision
14.1
Bias
14.2
Use of ASTM Rounding
15
Keywords
16
ANNEXES
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
Measurement of Connecting Rod Bearing Clearance and
Journal Taper
Annex A5
Measurement of Main Bearing Clearance
Annex A6
Measurement of Piston-to-Sleeve Clearance
Annex A7
Control Chart Technique for a Laboratory's Severity
Adjustment (SA)
Annex A8
Recommended New Liner Honing Procedure
Annex A9
Sequence VIII Oil Priming Procedure
Annex A10
Alternative Crankcase Breather Configuration
Annex A11
Connecting Rod Bearing Cleaning Procedure
Annex A12
Electronic Ignition Conversion
Annex A13
System Response Procedure
Annex A14
Air-Fuel Ratio Measurement
Annex A15
Lead Decontamination Procedure
Annex A16
Crankshaft Rear Seal Conditioning
Annex A17
Report Forms and Data Dictionary
Annex A18
Stay-in-Grade Oil Analysis Procedure
Annex A19
APPENDIXES
Suggested Method for Salvaging Camshaft Bearing Journals
Appendix X1
Data Log Sheets
Appendix X2
1.5 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 precautionary statements are provided throughout this test method.
1.6 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.