This SAE Standard defines the limits for a classification of automotive gear lubricants in rheological terms only. Other lubricant characteristics are not considered.
Rationale
The SAE J306 Standard defines the limits for a classification of automotive gear lubricants in rheological terms. This standard is intended for use by equipment manufacturers in defining and recommending automotive gear, axle, and manual transmission lubricants. In 1998 and 2005, SAE created new viscosity grades in SAE J306 to better balance fuel economy and durability. In recent years, there has been greater focus on lower viscosity automotive gear lubricants to reduce churning power loss and improve operating efficiency. However, the current SAE J306 specification does not adequately define future low viscosity fluids. The newly revised SAE J306 standard addresses this shortcoming by tightening the broad kinematic viscosity window of SAE 80 grade as well as adding kinematic viscosity ranges for fluids below 7 cSt (currently SAE 80 lower limit). Ultimately, this standard will enable a more precise classification of automotive gear oil products as innovation continues in this space.
The Driveline and Chassis Lubrication Technical Committee is responsible for development of SAE Standards, Recommended Practices, Information Reports and related information pertinent to the classification, performance characteristics, physical properties and test requirements for: lubricants designed for the use in axles, differentials, power dividers, transmissions, and hydraulic components used in automotive-type vehicles and their associated equipment ; selection of greases and maintenance of parts by the standardization of terms and grease lubricated parts of automotive equipment , procedures and specifications of hydraulic fluids used in automatic shift transmissions, wet brake systems and hydraulic systems. The Fuel and Lubricants Steering Committee has been formed under the committee's direction. Participants in the SAE Driveline and Chassis Lubrication Technical Committee include OEMs, suppliers, consulting firms, government and other interested parties.
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