ASTM_D_6891_-_21e1.pdf

Designation:D6891211Standard Test Method forEvaluation of Automotive Engine Oils in the Sequence IVASpark-Ignition Engine1This standard is issued under the fixed designation D6891;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1NOTEEditorially updated TMC governance information in June 2022.INTRODUCTIONPortions of this test method are written for use by laboratories that make use of ASTM TestMonitoring Center(TMC)2services(see Annex A1).The TMC provides reference oils,and engineering and statistical services to laboratories that desireto produce test results that are statistically similar to those produced by laboratories previouslycalibrated by the TMC.In general,the Test Purchaser decides if a calibrated test stand is to be used.Organizations such astheAmerican Chemistry Council require that a laboratory utilize the TMC services as part of their testregistration process.In addition,the American Petroleum Institute and the Gear Lubricant ReviewCommittee of the Lubricant Review Institute(SAE International)require that a laboratory use theTMC services in seeking qualification of oils against their specifications.The advantage of using the TMC services to calibrate test stands is that the test laboratory(andhence the Test Purchaser)has an assurance that the test stand was operating at the proper level of testseverity.It should also be borne in mind that results obtained in a non-calibrated test stand may notbe the same as those obtained in a test stand participating in the ASTM TMC services process.Laboratories that choose not to use the TMC services may simply disregard these portions.1.Scope*1.1 This test method measures the ability of crankcase oil tocontrol camshaft lobe wear for spark-ignition engines equippedwith an overhead valve-train and sliding cam followers.Thistest method is designed to simulate extended engine idlingvehicle operation.The Sequence IVA Test Method uses aNissan KA24E engine.The primary result is camshaft lobewear(measured at seven locations around each of the twelvelobes).Secondary results include cam lobe nose wear andmeasurement of iron wear metal concentration in the usedengine oil.Other determinations such as fuel dilution ofcrankcase oil,non-ferrous wear metal concentrations,and totaloil consumption,can be useful in the assessment of the validityof the test results.21.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.2.1 ExceptionsWhere there is no direct SI equivalentsuch as pipe fittings,tubing,NPT screw threads/diameters,orsingle source equipment specified.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.See Annex A8 for specific safety precautions.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.B0 on Automotive Lubricants.Current edition approved April 1,2021.Published April 2021.Originallyapproved in 2003.Last previous edition approved in 2015 as D6891 15.DOI:10.1520/D6891-21E01.2The ASTM Test Monitoring Center will update changes in this test method bymeans of Information Letters.Information letters may be obtained from the ASTMTest Monitoring Center(TMC),203 Armstrong Drive,Freeport,PA 16229,Attention:Director.www.astmtmc.org.This edition incorporates all InformationLetters through No.201.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.12.Referenced Documents2.1 ASTM Standards:3D235 Specification for Mineral Spirits(Petroleum Spirits)(Hydrocarbon Dry Cleaning Solvent)D287 Test Method for API Gravity of Crude Petroleum andPetroleum Products(Hydrometer Method)D323 Test Method for Vapor Pressure of Petroleum Products(Reid Method)D381 Test Method for Gum Cont