Isn't it a good possibility that it is formulated with primarily group 4 base oils? It does meet all the specs that the soon to be no more 0w30 does or am I wrong. It would seem this oil would be a logical choice for those lamenting the loss of 0W30. GC was very close to being a 40W was it not? I saw a new bottle of the 5W40 and it said on the back that it was made in the US from imported components. Maybe it's PAO??? Anyone informed on this subject?