ILSAC GF-6 will be split into two subcategories: GF-6A and GF-6B. The principal difference between the two subcategories of oils concerns viscosity grade and high temperature, high shear (HTHS) 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 LSPI
  • 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