Mass Wine Guy,
The Elixion is a PAO/Ester, you can tell by looking at the physical properties, specifically the Noack Volatility of 8.5%. If this was a Group III basestock that figure would be more like 11%-12%. The combination of pour point and flash point also give it away. Finally, I don't think you'd want to make a 5w-30 HD diesel oil using Group III stocks. It would probably not be shear stable enough.
For cold weather climates I'd probably give the edge to the Elixion over Delvac 1. However, that is based strictly on a comparison of the specs, not any hard data. Delvac 1 has proven to work very well in the TDI, so it will be interesting to see how the Elixion compares to D1 and the Series 3000, 5w-30.