Standard Historical Last Updated: Dec 31, 2010 Track Document
ASTM D5966-08

Standard Test Method for Evaluation of Engine Oils for Roller Follower Wear in Light-Duty Diesel Engine

Standard Test Method for Evaluation of Engine Oils for Roller Follower Wear in Light-Duty Diesel Engine D5966-08 ASTM|D5966-08|en-US Standard Test Method for Evaluation of Engine Oils for Roller Follower Wear in Light-Duty Diesel Engine Standard new BOS Vol. 05.02 Committee D02
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Significance and Use

This test method is used to determine the ability of an engine crankcase oil to control wear that can develop in the field under low to moderate engine speeds and heavy engine loads. Side-by-side comparisons of two or more oils in delivery van fleets were used to demonstrate the field performance of various oils. The specific operating conditions of this test method were developed to provide correlation with the field performance of these oils.

This test method, along with other test methods, defines the minimum performance level of the Category API CG-4 for heavy duty diesel engine lubricants. Passing limits for this category are included in Specification D 4485.

The design of the engine used in this test method is not representative of all modern diesel engines. This factor, along with the specific operating conditions used to accelerate wear, shall be considered when extrapolating test results.


1.1 This engine lubricant test method is commonly referred to as the Roller Follower Wear Test. Its primary result, roller follower shaft wear in the hydraulic valve lifter assembly, has been correlated with vehicles used in stop-and-go delivery service prior to 1993. It is one of the test methods required to evaluate lubricants intended to satisfy the API CG-4 performance category. This test has also been referred to as the 6.2 L Test.

1.2 The values of units used in this test method are stated in either inch-pound units or SI units and are to be regarded separately as the 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.

1.4 Table of Contents:

Referenced Documents2
Summary of Test Method4
Significance and Use5
Guidelines on Substitution7.1
Preparation of Apparatus8
New Engine Preparation8.1
Installation of Auxiliary Systems and
Miscellaneous Components
Test Procedure9
Description of Test Segments and Organization
of Test Procedure Sections
Engine Parts Replacement9.2
Engine Starting Procedure9.3
Normal Engine Shutdown Procedure9.4
Emergency Shutdown Procedure9.5
Unscheduled Shutdown and Downtime9.6
New Engine Break-In9.7
Pretest Procedure9.8
Fifty-Hour Steady State Test9.9
Periodic Measurements9.10
Oil Sampling and Oil Addition Procedures9.11
End of Test (EOT) Procedure9.12
Calculation and Interpretation of Test Results10
Environment of Parts Measurement Area10.1
Roller Follower Shaft Wear Measurements10.2
Oil Analysis10.3
Assessment of Test Validity10.4
Final Test Report11
Reporting Calibration Test Results11.1
Report Forms11.2
Interim Non-Valid Calibration Test Summary11.3
Severity Adjustments11.4
Precision and Bias13
Precision Estimate13.2
Guidelines for Test Part Substitution or ModificationAnnex A1
Guidelines for Units and Specification FormatsAnnex A2
Detailed Specifications of ApparatusAnnex A3
CalibrationAnnex A4
Final Report FormsAnnex A5
IllustrationsAnnex A6
Kinematic Viscosity at 100°C Procedure for the
Roller Follower Wear Test
Annex A7
Enhanced Thermal Gravimetric Analysis (TGA)
Procedure for Soot Measurement
Annex A8
Sources of Materials and InformationAnnex A9
PC-9 Reference Diesel Fuel PropertiesAppendix X1
Diagnostic Data ReviewAppendix X2

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Book of Standards Volume: 05.02
Developed by Subcommittee: D02.B0.02
Pages: 18
DOI: 10.1520/D5966-08
ICS Code: 19.020; 75.100