Designation:D5968−14StandardTestMethodforEvaluationofCorrosivenessofDieselEngineOilat121°C1ThisstandardisissuedunderthefixeddesignationD5968;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONThemethoddescribedinthistestmethodisbasedonthegasturbinelubricantcorrosionandoxidationtestdescribedinFederalTestMethodStandard791,Method5308.Becausethistestmethodrelatestocorrosionindieselenginesratherthaningasturbines,temperatures,metalcoupons,andcertainpartsofthetestprocedureweremodifiedtobemoreappropriateforheavydutydieselengines.Themethoddescribedinthistestmethodcanbeusedbyanyproperlyequippedlaboratory,withoutoutsideassistance.However,theASTMTestMonitoringCenter(TMC)2providesreferenceoilsandanassessmentofthetestresultsobtainedonthoseoilsbythelaboratory(seeAnnexA1).Bythesemeans,thelaboratorywillknowwhethertheiruseofthetestmethodgivesresultsstatisticallysimilartothoseobtainedbyotherlaboratories.Furthermore,variousagenciesrequirethatalaboratoryutilizetheTMCservicesinseekingqualificationofoilsagainstspecifications.Forexample,theU.S.ArmyimposessucharequirementinconnectionwithseveralArmyenginelubricatingoilspecifications.Accordingly,thistestmethodiswrittenforusebylaboratoriesthatutilizetheTMCservices.LaboratoriesthatchoosenottousethoseservicesmaysimplyignorethoseportionsofthetestmethodthatrefertotheTMC.ThistestmethodmaybemodifiedbymeansofInformationLettersissuedbytheTMC.Inaddition,theTMCmayissuesupplementarymemorandarelatedtothemethod(seeAnnexA1).Forotherinformation,refertotheresearchreportontheCumminsBenchCorrosionTest.31.Scope*1.1Thistestmethodisusedtotestdieselenginelubricantstodeterminetheirtendencytocorrodevariousmetals,specifi-callyalloysofleadandcoppercommonlyusedincamfollowersandbearings.Correlationwithfieldexperiencehasbeenestablished.41.2Thevaluesstat...
