SHEARSTABILITYOFMULTIGRADECRANKCASEOILEstablishmentofFieldDataandCorrelationwithLaboratoryEngineandBenchTestResultsPreparedbytheDataAnalysisPanelofASTMCommitteeD-2ResearchandDevelopmentDivisionVIIB-1ontheShearStabilityofCrankcaseOilsASTMDATASERIESPUBLICATIONDS49Listprice$7.7505-049000-12AMERICANSOCIETYFORTESTINGANDMATERIALSANNiVEtsARr1916RaceStreet,Philadelphia,Pa.19103©byAmericanSocietyforTestingandMaterials1973LibraryofCongressCatalogCardNumber:73-78863NOTETheSocietyisnotresponsible,asabody,forthestatementsandopinionsadvancedinthispublication.PrintedinNewCarlisle,OhioJune1973-1-I.SUMMARYExtensivefieldtestdatahavebeenobtainedwhichcanserveasabasisforevaluatingtheabilityofvariouslaboratorymethodstopredicttheshearstabilityofmultigradecrankcaseoils.Thisbasiswasdevelopedbydeterminingtheaverageviscositychangesofonesinglegradeandtwelvemultigradereferenceoilsinsixseparatecarfleets.ThetwelvemultigradeoilswereformulatedwithallofthechemicaltypesofVIimproverscurrentlyinuse,orlikelytobeused,inthenearfuture.Asasecondpartoftheprogram,fourtypesofbenchtestsandthreedifferentlaboratoryenginetestswereevaluatedfortheirabilitytopredicttheaverageviscositychangesofthethirteenrefer-enceoilsobservedinthefleettests.Correlationofthelaboratorymethodsresultswiththefielddatawasmarredbythenon-conformanceoftwomultigradeoils.Thisnon-conformancewasmorenoticeableinthebenchtestresultsthaninthelaboratoryenginetestdata.Thecontroloil(ARC*-113)whichdidnotcontainaVJ.improver,showedameasurableviscosityincreaseinthe1500milefieldtests.Thisindicatedthatfactorsotherthanmechanicalshearmayhaveinflu-encedtheviscositychangesofthemultigradeoilsinthefieldtests.Consequently,thesefactorsmustberecognizedinanyattempttoadjusttestconditionsforabenchtestsothatitsresultsagreewiththefieldtestdata.II.INTRODUCTIONANDBACKGROUNDEvaluationoftheviscositystabilityofmultigradeoilshasbeenamajorconcernofSectionBofASTMR&DDiv.VIIsinceitsorganiza-tionin1952.In1955,sixparticipantsrantestsontwohydraulicfluidsformulatedwithtwodifferentmo...
