Designation:D7320−15aStandardTestMethodforEvaluationofAutomotiveEngineOilsintheSequenceIIIG,Spark-IgnitionEngine1ThisstandardisissuedunderthefixeddesignationD7320;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONPortionsofthistestmethodarewrittenforusebylaboratoriesthatmakeuseofASTMTestMonitoringCenter(TMC)2services(seeAnnexA1).TheTMCprovidesreferenceoils,andengineeringandstatisticalservicestolaboratoriesthatdesiretoproducetestresultsthatarestatisticallysimilartothoseproducedbylaboratoriespreviouslycalibratedbytheTMC.Ingeneral,theTestPurchaserdecidesifacalibratedteststandistobeused.OrganizationssuchastheAmericanChemistryCouncilrequirethatalaboratoryutilizetheTMCservicesaspartoftheirtestregistrationprocess.Inaddition,theAmericanPetroleumInstituteandtheGearLubricantReviewCommitteeoftheLubricantReviewInstitute(SAEInternational)requirethatalaboratoryusetheTMCservicesinseekingqualificationofoilsagainsttheirspecifications.TheadvantageofusingtheTMCservicestocalibrateteststandsisthatthetestlaboratory(andhencetheTestPurchaser)hasanassurancethattheteststandwasoperatingattheproperleveloftestseverity.Itshouldalsobeborneinmindthatresultsobtainedinanon-calibratedteststandmaynotbethesameasthoseobtainedinateststandparticipatingintheASTMTMCservicesprocess.LaboratoriesthatchoosenottousetheTMCservicesmaysimplydisregardtheseportions.1.Scope*1.1Thistestmethodcoversanenginetestprocedureforevaluatingautomotiveengineoilsforcertainhigh-temperatureperformancecharacteristics,includingoilthickening,varnishdeposition,oilconsumption,aswellasenginewear.Suchoilsincludebothsingleviscositygradeandmultiviscositygradeoilsthatareusedinbothspark-ignition,gasoline-fueledengines,aswellasindieselengines.1.1.1Additionally,withnonmandatorysupplementalrequirements,aIIIGATest(MiniRotaryVisc...
