ASTM D6709 : 21a

Standard Test Method for Evaluation of Automotive Engine Oils in the Sequence VIII Spark-Ignition Engine (CLR Oil Test Engine)

Standard Details

1.1 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
Test Fuel Specification		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 StandardDetails, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.