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IntheASTMsystem,aspecificAPIdesignationisassignedtoeachcategory.Thesystemisopen-ended,thatis,newdesignationsareassignedforusewithnewcategoriesaseachnewsetofoilperformancecharacteristicsaredefined.Oilcategoriesmaybereferencedbyenginebuildersinmakinglubricantrecommendations,andusedbylubricantsuppliersandcustomersinidentifyingproductsforspecificapplications.Whereapplicable,candidateoilprogramsareconductedinaccordancewiththeAmericanChemistryCouncil(ACC)PetroleumAdditivesProductApprovalCodeofPractice
ThisstandardisissuedunderthefixeddesignationD4485;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(′)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense
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