What does the GF-6 standard mean?

[McHaven]

GF-6 is actually an engine oil quality certification standard established by the International Lubricant Standardization and Approval Committee (ILSAC). This standard is largely based on API certification but places greater emphasis on fuel economy, hence it typically uses lower viscosity. GF-6 standard classification: The GF-6 standard is divided into GF-6A and GF-6B. On May 2020, when GF-6A came into effect, it replaced the GF-5 and older standards. Incompatibility with older versions: GF-6 is not compatible with previous older standards and is only recommended for use in new vehicles that require 0W-16 oil, primarily Japanese cars at present. Not recommended for xW-40 viscosity oil: Similar to the GF-5 standard, GF-6A-B does not recommend any xW-40 viscosity oil, mainly due to greater consideration for fuel economy.