Is Amsoil really DexosD spec approved? Or is it Amsoil telling you it meets the spec?
I wouldn't risk my warranty on an oil that wasn't DexosD rated.
And for the MLM crowd, I've been down the Amsoil path. Used it for quite a while in my Cummins with good results. I had a different experience with their synthetic diff fluid that they said was rated to the applicable SAE spec. A friend with a PowerStroke had the exact same experience.
When I drilled down it turned out they were using their own testing methods to validate their oils. I heard the spiel about the cost of getting an industry standard certification, blah, blah, blah.
I'll go with actual DexosD rated oil, thank you very much.
If Amsoil actually is DexosD rated, then I apologize in advance.