International Lubricants Standardization and Approval Committee. A collaboration between the American Automobile Manufacturers Association (AAMA), Chrysler, Ford, GM, and the Japanese Automotive Standards Organization. ILSAC GF- engine oil specifications target fuel economy, emission system protection, and enhanced engine oil robustness. GF-6 will be split into two subcategories: GF-6A and GF-6B. The principal difference between the two subcategories of oils concerns A measure of a fluid's resistance to flow. A fluid with a higher viscosity flows less easily. grade and high temperature, high shear (High Temperature High Shear. A measure of a fluid’s resistance to flow under conditions resembling highly-loaded journal bearings in fired internal combustion engines, typically 1 million s–1 at 150°C.) performance.
The proposed ILSAC GF-6A specification would replace the current ILSAC GF-5 specification, represented by the starburst/certification trademark, and would provide a new performance level of an engine oil for spark-ignited internal combustion engines.
The proposed ILSAC GF-6B will provide the same performance as GF-6A, but with the added aim of lower HTHS to deliver potential further fuel economy benefits. ILSAC GF-6B will be defined for 0W-16 viscosity grade oils only.
GF-6A – The attributes of GF-6A include the following:
- Backwards compatible with older engines
- Better durability to mitigate Low-Speed Pre-Ignition. Uncontrolled combustion that takes place in the combustion chamber prior to spark in gasoline direct injection (GDI) engines.
- Good fuel economy, as measured by Sequence VIE
- Current ILSAC GF-5 SAE grades
- 6 mPa.s HTHS
GF-6B – The attributes of GF-6B include the following:
- Not backwards compatible with older engines
- Better durability to mitigate LSPI
- Better fuel economy, as measured by Sequence VIF
- Fuel economy grade of SAE 0W-16
- 3-2.6 mPa.s HTHS