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 Covers SAE 0W-20, 5W-20, 0W-30, 5W-30 and 10W-30 viscosity grades For XW-20, min HTHS = 2.6; for XW-30, min HTHS = 2.9 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 Covers only SAE 0W-16 viscosity grade with min HTHS = 2.3