Just to be fair... I can find no information about Amsoil oils meeting or even developing a CJ4 spec'd oil??? Does anyone have any information or know where to look? Some of the sites/forums that come up when you "Google" Amsoil CJ4.... produces some results where people state that only API certified oils meeting CJ4 specs (for new 2007 trucks) is mandated and that Amsoil will not have such????

But again, I am trying to be fair and ask any Amsoil sellers/marketeers and lovers if they can produce any information about this new oil spec at Amsoil??? Curious, since none of the big boy oil companies have a synthetic version or a cold temp viscosity oil of 5W-40.

Thanks,