Designation:D7216−22StandardTestMethodforDeterminingAutomotiveEngineOilCompatibilitywithTypicalSealElastomers1ThisstandardisissuedunderthefixeddesignationD7216;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONAnyproperlyequippedlaboratory,withoutoutsideassistance,canusethetestmethoddescribedinthisstandard.However,theASTMTestMonitoringCenter(TMC)2providesareferenceoil(TMC1006-1)andanassessmentofthetestresultsobtainedwiththisoilandthereferenceelastomers.Bythesemeans,thelaboratorywillknowwhethertheiruseofthetestmethodgivesresultsstatisticallysimilartothoseobtainedbyotherlaboratories.TheTMCalsousesthereferenceoilresultsondifferentbatchesofelastomersfromdifferentlaboratoriestoupdatecontinuallythetotalandwithin-laboratorystandarddeviationestimates.Somespecifications,forexample,SpecificationD4485,usetheupdatedTMCstandarddeviationestimates,pertainingatthetimetestoilsareevaluated,toadjustspecificationlimitsfortheeffectsoftheindustrytestvariability.VariousagenciesrequirethatalaboratoryutilizetheTMCservicesinseekingqualificationofoilsagainstspecifications.Forexample,theU.S.ArmyimposessucharequirementinconnectionwithseveralArmyenginelubricatingoilspecifications.Accordingly,thistestmethodiswrittenforusebylaboratoriesthatutilizetheTMCservices.LaboratoriesthatchoosenottousethoseservicesmaysimplyignorethoseportionsofthetestmethodthatrefertotheTMC.ThistestmethodmaybemodifiedbymeansofinformationlettersissuedbytheTMC.Inaddition,theTMCmayissuesupplementarymemorandarelatedtothistestmethod.1.Scope*1.1Thistestmethodcoversquantitativeproceduresfortheevaluationofthecompatibilityofautomotiveengineoilswithseveralreferenceelastomerstypicalofthoseusedinthesealingmaterialsincontactwiththeseoils.Compatibilityisevaluatedbydeterminingthechangesinvolume,DurometerAhardness,andtens...
