The reason they no longer meet A5/B5 is because they can't pass a new test added to the ACEA 2016 sequence, but that new test is done on a diesel engine and really only relevant to diesels.
Castrol promised a revised formula that would meet the new A5/B5-16, but it doesn't seem to have been released.
Valvoline tries to use a disclaimer that their synthetic 5w30 meets A5/B5 for gasoline engines only, but ACEA does not allow this. If it doesn't meet the standards for both gas *and* diesel engines, it doesn't meet them at all!
Originally Posted By: bigjl
Also I don’t remember seeing an oil that was just A1/B1 for years they usually always meet A5/B5.
0w20 and 5w20 synthetics were A1/B1 but not A5/B5 because A5/B5 requires HTHS of at least 2.9,m whereas A1/B1 allowed an exception for __w20 where the HTHS could be 2.6
and as QP said, ACEA recently dropped A1/B1.