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    ASTM D5966 - 13

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

    Active Standard ASTM D5966 | Developed by Subcommittee: D02.B0.02

    Book of Standards Volume: 05.02

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    Significance and Use

    5.1 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 torques. 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.

    5.2 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 D4485.

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

    1. Scope

    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 stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

    1.2.1 Exceptions—Where there is no direct SI equivalent, such as pipe fittings, thermocouple diameters, and NPT screw threads. Also, roller follower wear is measured in mils.

    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 Documents




    Summary of Test Method


    Significance and Use




     Guidelines on Substitution




    Preparation of Apparatus


     New Engine Preparation


     Installation of Auxiliary Systems and
     Miscellaneous Components


    Test Procedure


     Description of Test Segments and Organization
     of Test Procedure Sections


     Engine Parts Replacement


     Engine Starting Procedure


     Normal Engine Shutdown Procedure


     Emergency Shutdown Procedure


     Unscheduled Shutdown and Downtime


     New Engine Break-In


     Pretest Procedure


     Fifty-Hour Steady State Test


     Periodic Measurements


     Oil Sampling and Oil Addition Procedures


     End of Test (EOT) Procedure


    Calculation and Interpretation of Test Results


     Environment of Parts Measurement Area


     Roller Follower Shaft Wear Measurements


     Oil Analysis


     Assessment of Test Validity


    Final Test Report


     Reporting Calibration Test Results


     Report Forms


     Interim Non-Valid Calibration Test Summary


     Severity Adjustments


    Precision and Bias




     Precision Estimate







    Guidelines for Test Part Substitution or Modification

    Annex A1

    Guidelines for Units and Specification Formats

    Annex A2

    Detailed Specifications of Apparatus

    Annex A3


    Annex A4

    Final Report Forms

    Annex A5


    Annex 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 Information

    Annex A9


    PC-9 Reference Diesel Fuel Properties

    Appendix X1

    Diagnostic Data Review

    Appendix X2

    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

    D86 Test Method for Distillation of Petroleum Products at Atmospheric Pressure

    D93 Test Methods for Flash Point by Pensky-Martens Closed Cup Tester

    D97 Test Method for Pour Point of Petroleum Products

    D130 Test Method for Corrosiveness to Copper from Petroleum Products by Copper Strip Test

    D235 Specification for Mineral Spirits (Petroleum Spirits) (Hydrocarbon Dry Cleaning Solvent)

    D287 Test Method for API Gravity of Crude Petroleum and Petroleum Products (Hydrometer Method)

    D445 Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and Calculation of Dynamic Viscosity)

    D446 Specifications and Operating Instructions for Glass Capillary Kinematic Viscometers

    D482 Test Method for Ash from Petroleum Products

    D524 Test Method for Ramsbottom Carbon Residue of Petroleum Products

    D613 Test Method for Cetane Number of Diesel Fuel Oil

    D664 Test Method for Acid Number of Petroleum Products by Potentiometric Titration

    D976 Test Method for Calculated Cetane Index of Distillate Fuels

    D1319 Test Method for Hydrocarbon Types in Liquid Petroleum Products by Fluorescent Indicator Adsorption

    D2274 Test Method for Oxidation Stability of Distillate Fuel Oil (Accelerated Method)

    D2500 Test Method for Cloud Point of Petroleum Products

    D2622 Test Method for Sulfur in Petroleum Products by Wavelength Dispersive X-ray Fluorescence Spectrometry

    D2709 Test Method for Water and Sediment in Middle Distillate Fuels by Centrifuge

    D4052 Test Method for Density, Relative Density, and API Gravity of Liquids by Digital Density Meter

    D4175 Terminology Relating to Petroleum, Petroleum Products, and Lubricants

    D4485 Specification for Performance of Active API Service Category Engine Oils

    D4737 Test Method for Calculated Cetane Index by Four Variable Equation

    D5185 Test Method for Determination of Additive Elements, Wear Metals, and Contaminants in Used Lubricating Oils and Determination of Selected Elements in Base Oils by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES)

    D7422 Test Method for Evaluation of Diesel Engine Oils in T-12 Exhaust Gas Recirculation Diesel Engine

    E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

    American National Standards Institute (ANSI)

    MC96.1 Temperature Measurement Thermocouples

    ICS Code

    ICS Number Code 19.020 (Test conditions and procedures in general); 75.100 (Lubricants, industrial oils and related products)

    UNSPSC Code

    UNSPSC Code 15121501(Engine oil)

    Referencing This Standard

    DOI: 10.1520/D5966-13

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM D5966-13, Standard Test Method for Evaluation of Engine Oils for Roller Follower Wear in Light-Duty Diesel Engine, ASTM International, West Conshohocken, PA, 2013,

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