1.1 This specification covers mineral and synthetic oils of the types API groups I, II, III, and IV used in hydraulic systems, where the performance requirements demand fluids with one of the following characteristics:
1.1.1 A refined base oil or synthetic base stock (Class HH),
1.1.2 A refined mineral base oil or synthetic base stock with rust and oxidation inhibitors (Class HL),
1.1.3 A refined mineral base oil or synthetic base stock with rust and oxidation inhibitors plus anti-wear characteristics (Class HM),
1.1.4 A refined mineral base oil or synthetic base stock with rust and oxidation inhibitors, anti-wear characteristics, and increased viscosity index higher than 140 (Class HV),
1.1.5 A refined mineral base oil or synthetic base stock with rust and oxidation inhibitors plus anti-wear characteristics meeting a higher performance level than an HM fluid to address higher demanding hydraulic systems (Class HMHP), and
1.1.6 A refined mineral base oil with rust or synthetic base stock and oxidation inhibitors, anti-wear characteristics, and increased viscosity index higher than 140 meeting a higher performance level than an HV fluid to address higher demanding hydraulic systems (Class HVHP).
1.2 This specification defines the requirements of mineral oil-based or synthetic-based hydraulic fluids that are compatible with most existing machinery components when there is adequate maintenance.
1.3 This specification defines only new lubricating oils before they are installed in the hydraulic system.
1.4 This specification defines specific types of hydraulic oils. It does not include all hydraulic oils. Some oils that are not included may be satisfactory for certain hydraulic applications. Certain equipment or conditions of use may permit or require a wider or narrower range of characteristics than those described herein.
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5.1 Exception—In X1.3.9 on Wear Protection, the values of pump pressure are in MPa, and the psi follows in brackets as a reference point immediately recognized by a large part of the industry.
1.6 The following safety hazard caveat pertains to the test methods referenced in this specification. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
ASTM D6158-18 Referenced Document
ASTM D1298 Standard Test Method for Density, Relative Density (Specific Gravity), or API Gravity of Crude Petroleum and Liquid Petroleum Products by Hydrometer Method
ASTM D130 Standard Test Method for Detection of Copper Corrosion from Petroleum Products by the Copper Strip Tarnish Test
ASTM D1401 Standard Test Method for Water Separability of Petroleum Oils and Synthetic Fluids
ASTM D2070 Standard Test Method for Thermal Stability of Hydraulic Oils
ASTM D2270 Standard Practice for Calculating Viscosity Index From Kinematic Viscosity at 40 and 100176C
ASTM D2422 Standard Classification of Industrial Fluid Lubricants by Viscosity System
ASTM D2619 Standard Test Method for Hydrolytic Stability of Hydraulic Fluids (Beverage Bottle Method)
ASTM D2983 Standard Test Method for Low-Temperature Viscosity of Lubricants Measured by Brookfield Viscometer
ASTM D3427 Standard Test Method for Air Release Properties of Petroleum Oils
ASTM D4052 Standard Test Method for Density and Relative Density of Liquids by Digital Density Meter
ASTM D4310 Standard Test Method for Determination of the Sludging and Corrosion Tendencies of Inhibited Mineral Oils
ASTM D445 Standard Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (the Calculation of Dynamic Viscosity)
ASTM D471 Standard Test Method for Rubber Property-Effect of Liquids
ASTM D5182 Standard Test Method for Evaluating the Scuffing Load Capacity of Oils (FZG Visual Method)
ASTM D5950 Standard Test Method for Pour Point of Petroleum Products (Automatic Tilt Method)
ASTM D6080 Standard Practice for Defining the Viscosity Characteristics of Hydraulic Fluids
ASTM D664 Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration
ASTM D665 Standard Test Method for Rust-Preventing Characteristics of Inhibited Mineral Oil in the Presence of Water
ASTM D6973 Standard Test Method for Indicating Wear Characteristics of Petroleum Hydraulic Fluids in a High Pressure Constant Volume Vane Pump*, 2019-12-01 Update
ASTM D7042 Standard Test Method for Dynamic Viscosity and Density of Liquids by Stabinger Viscometer (and the Calculation of Kinematic Viscosity)*, 2021-11-01 Update
ASTM D7043 Standard Test Method for Indicating Wear Characteristics of Non-Petroleum and Petroleum Hydraulic Fluids in a Constant Volume Vane Pump*, 2021-12-01 Update
ASTM D7752 Standard Practice for Evaluating Compatibility of Mixtures of Hydraulic Fluids
ASTM D892 Standard Test Method for Foaming Characteristics of Lubricating Oils
ASTM D92 Standard Test Method for Flash and Fire Points by Cleveland Open Cup
ASTM D943 Standard Test Method for Oxidation Characteristics of Inhibited Mineral Oils
ASTM D97 Standard Test Method for Pour Point of Petroleum Products
ASTM D974 Standard Test Method for Acid and Base Number by Color-Indicator Titration
ISO 13357-1 Petroleum products - Determination of the filterability of lubricating oils - Part 1: Procedure for oils in the presence of water
ISO 13357-2 Petroleum products - Determination of the filterability of lubricating oils - Part 2: Procedure for dry oils
ASTM D6158-18 history
2023ASTM D6158-23 Standard Specification for Mineral Hydraulic Oils
2018ASTM D6158-18 Standard Specification for Mineral Hydraulic Oils
2016ASTM D6158-16 Standard Specification for Mineral Hydraulic Oils
2014ASTM D6158-14 Standard Specification for Mineral Hydraulic Oils
2010ASTM D6158-10 Standard Specification for Mineral Hydraulic Oils
2005ASTM D6158-05 Standard Specification for Mineral Hydraulic Oils
1999ASTM D6158-99 Standard Specification for Mineral Hydraulic Oils