Designation:D7549−21StandardTestMethodforEvaluationofHeavy-DutyEngineOilsunderHighOutputConditions—CaterpillarC13TestProcedure1ThisstandardisissuedunderthefixeddesignationD7549;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONAnyproperlyequippedlaboratory,withoutoutsideassistance,canusethetestproceduredescribedinthistestmethod.TheASTMTestMonitoringCenter(TMC)2providescalibrationandanassessmentofthetestresultsobtainedonthoseoilsbythelaboratory.Bythismeansthelaboratorywillknowwhetheritsuseofthetestmethodgivesresultsstatisticallysimilartothoseobtainedbyotherlaboratories.Furthermore,variousagenciesrequirethatalaboratoryutilizestheTMCservicesinseekingqualificationofoilsagainstspecifications.Forexample,theU.S.Armyhassucharequirementinsomeofitsengineoilspecifications.Accordingly,thistestmethodiswrittenforthoselaboratoriesthatusetheTMCservices.LaboratoriesthatchoosenottousetheseservicesshouldignorethoseportionsofthetestmethodthatrefertotheTMC.Informationletters2issuedperiodicallybytheTMCmaymodifythistestmethod.InadditiontheTMCmayissuesupplementarymemorandarelatedtothetestmethod.ASTMInternationalpolicyistoencouragethedevelopmentoftestproceduresbasedongenericequipment.Itisrecognizedthatthereareoccasionswherecritical/sole-sourceequipmenthasbeenapprovedbythetechnicalcommittee(surveillancepanel/taskforce)andisrequiredbythetestprocedure.Thetechnicalcommitteethatoverseesthetestprocedureisencouragedtoclearlyidentifyifthepartisconsideredcriticalinthetestprocedure.Ifapartisdeemedtobecritical,ASTMencouragesalternativesupplierstobegiventheopportunityforconsiderationofsupplyingthecriticalpart/componentprovidingtheymeettheapprovalprocesssetforthbythetechnicalcommittee.Analternativesuppliercanstarttheprocessbyinitiatingcontactwiththetechnicalcommittee(currentchairssho...
