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SHEARSTABILITYOF
MULTIGRADECRANKCASEOIL
EstablishmentofFieldDataand
CorrelationwithLaboratory
EngineandBenchTestResults
Preparedbythe
DataAnalysisPanelof
ASTMCommitteeD-2
ResearchandDevelopmentDivisionVIIB-1
ontheShearStabilityofCrankcaseOils
ASTMDATASERIESPUBLICATIONDS49
Listprice$7.75
05-049000-12
AMERICANSOCIETYFORTESTINGANDMATERIALS
ANNiVEtsARr1916RaceStreet,Philadelphia,Pa.19103
©byAmericanSocietyforTestingandMaterials1973
LibraryofCongressCatalogCardNumber:73-78863
NOTE
TheSocietyisnotresponsible,asabody,
forthestatementsandopinions
advancedinthispublication.
PrintedinNewCarlisle,Ohio
June1973
DS49-EB/Jun.1973
-1-
I.SUMMARY
Extensivefieldtestdatahavebeenobtainedwhichcanserve
asabasisforevaluatingtheabilityofvariouslaboratorymethodsto
predicttheshearstabilityofmultigradecrankcaseoils.Thisbasis
wasdevelopedbydeterminingtheaverageviscositychangesofonesingle
gradeandtwelvemultigradereferenceoilsinsixseparatecarfleets.
Thetwelvemultigradeoilswereformulatedwithallofthechemicaltypes
ofVIimproverscurrentlyinuse,orlikelytobeused,inthenearfuture.
Asasecondpartoftheprogram,fourtypesofbenchtests
andthreedifferentlaboratoryenginetestswereevaluatedfortheir
abilitytopredicttheaverageviscositychangesofthethirteenrefer-
enceoilsobservedinthefleettests.Correlationofthelaboratory
methodsresultswi
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