Designation:D7899−19StandardTestMethodforMeasuringtheMeritofDispersancyofIn-ServiceEngineOilswithBlotterSpotMethod1ThisstandardisissuedunderthefixeddesignationD7899;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversaprocedurefordeterminationofthemeritofdispersancyofdieselcrankcaseengineoilsaswellasothertypesofengineoilswherepollutantsofdiversesourcessuchassootfromcombustion,metallicparticlesfromwear,corrosionofmechanicalparts,andinsolubleproductsresultingfromtheoxidationoftheoilmaycontaminatethelubricant.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.NOTE1—Itisnottheintentofthistestmethodtoestablishorrecommendnormal,cautionary,warning,oralertlimitsforanymachinery.Suchlimitsshouldbeestablishedinconjunctionwithadviceandguidancefromthemachinerymanufacturerandmaintenancegroup.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D7418PracticeforSet-UpandOperationofFourierTrans-formInfrared(FT-IR)SpectrometersforIn-ServiceOilConditionMonitoring3.Terminology3.1Definitions:3.1.1dieselcrankcaseengineoils,n—anengineoilusedinthecrankcaseoftheinternalcombustiondieselengine.3.1.1.1Discussion—Itmaycontainadditivestoenhancecertainproperties.Inhibitionofenginerusting,...
