I don`t know whether this has been before-found some interesting info about Fiat Powertrain/Infineum/FL Selenia-Petronas co-operation in developing a SAE 0w-20 HD FE oil.
The first publication is from Lubes'N'Greases, 2008...page 18:
http://www.lngpublishing.com/LNGmagEMEA/LNG_july2008.pdf...