ASTM D6158-99 - 10.12.1999
 
1. Scope

1.1 This specification covers mineral oils used in hydraulic systems, where the performance requirements demand fluids with one of the following characteristics:

1.1.1 A refined base oil (Class HH).

1.1.2 A refined mineral base oil with rust and oxidation inhibitors (Class HL), and

1.1.3 A refined mineral base oil with rust and oxidation inhibitors plus antiwear characteristics (Class HM).

 
2. Referenced Documents

D5950-25

Standard Test Method for Pour Point of Petroleum Products (Automatic Tilt Method)

D5182-26

Standard Test Method for Evaluating the Scuffing Load Capacity of Oils (FZG A/8.3/90 Method)

D6973-14(2024)

Standard Test Method for Indicating Wear Characteristics of Petroleum Hydraulic Fluids in a High Pressure Constant Volume Vane Pump

D7043-24

Standard Test Method for Indicating Wear Characteristics of Non-Petroleum and Petroleum Hydraulic Fluids in a Constant Volume Vane Pump

D7752-26

Standard Practice for Evaluating Compatibility of Mixtures of Hydraulic Fluids

ISO 13357-1

Petroleum ProductsDetermination of the Filterability of Lubricating OilsPart 1: Procedure for Oils in the Presence of Water

ISO 13357-2

Petroleum ProductsDetermination of the Filterability of Lubricating oilsPart 2: Procedure for Dry Oils

DIN 51350-6

CEC L-45-A-99

Viscosity Shear Stability of Transmission Lubricants (KRL Taper Roller Bearing Rig)

D2422-24

Standard Classification of Industrial Fluid Lubricants by Viscosity System

D92-24

Standard Test Method for Flash and Fire Points by Cleveland Open Cup Tester

D97-17b(2022)

Standard Test Method for Pour Point of Petroleum Products (Includes all amendments and changes 11/29/2022).

D130-26

Standard Test Method for Corrosiveness to Copper from Petroleum Products by Copper Strip Test

D445-26

Standard Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and Calculation of Dynamic Viscosity)

D471-16a(2021)

Standard Test Method for Rubber Property—Effect of Liquids (Includes all amendments and changes 6/25/2021).

D664-24

Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration

D665-25

Standard Test Method for Rust-Preventing Characteristics of Inhibited Mineral Oil in the Presence of Water

D892-25

Standard Test Method for Foaming Characteristics of Lubricating Oils

D943-25

Standard Test Method for Oxidation Characteristics of Inhibited Mineral Oils

D974-22

Standard Test Method for Acid and Base Number by Color-Indicator Titration

D1298-24

Standard Test Method for Density, Relative Density, or API Gravity of Crude Petroleum and Liquid Petroleum Products by Hydrometer Method

D1401-21

Standard Test Method for Water Separability of Petroleum Oils and Synthetic Fluids

D2070-26

Standard Test Method for Thermal Stability of Hydraulic Oils

D2270-24

Standard Practice for Calculating Viscosity Index from Kinematic Viscosity at 40 ?C and 100 ?C

D2619-21

Standard Test Method for Hydrolytic Stability of Hydraulic Fluids (Beverage Bottle Method)

D2983-23

Standard Test Method for Low-Temperature Viscosity of Automatic Transmission Fluids, Hydraulic Fluids, and Lubricants using a Rotational Viscometer

D3427-26

Standard Test Method for Air Release Properties of Hydrocarbon Based Oils

D4052-22

Standard Test Method for Density, Relative Density, and API Gravity of Liquids by Digital Density Meter

D4310-22a

Standard Test Method for Determination of Sludging and Corrosion Tendencies of Inhibited Mineral Oils (Includes all amendments and changes 11/10/2022).

D6080-18a(2025)

Standard Practice for Defining the Viscosity Characteristics of Hydraulic Fluids (Includes all amendments and changes 10/28/2025).