GF-5 Tests

Determining performance to meet GF-5 specification

ILSAC GF-5 requires the development of a new test for measuring Fuel Economy and Fuel Economy Retention, the Sequence VID (pronounced "Six D").  The Sequence VID engine test will define minimum performance standards for fuel economy.  The test development program includes a carefully designed testing matrix to define test precision. 

Performance parameters for GF-5 are measured through a standardized set of engine, physical and chemical bench tests. To be licensed as an ILSAC GF-5 oil and carry the API starburst symbol, motor oils must first pass this battery of tests.

Engine tests

A series of laboratory engine tests ensure an oil meets all GF-5 performance requirements. Each engine test assesses one or more performance parameters, such as engine deposits, viscosity increase, valvetrain wear, fuel efficiency, or bearing corrosion.

Bench tests

Laboratory bench tests determine the lubricant's performance relative to corrosion, elastomer compatibility, oxidation stability, rust protection, emulsion stability, shear stability, and thermal stability.

Physical tests

A number of laboratory tests are run to determine the physical properties of the oil, such as viscosity, pour point, foaming tendency, and evaporation loss.

Chemical tests

Laboratory tests are also used to determine the chemical properties of engine oils. For example, additive elements, total base number (TBN), and sulfated ash. GF-5 oils must be tested for phosphorus, and sulfur content to determine if they are compatible with exhaust aftertreatment systems.