Guys, thought i'd share an update with you: Selenia WR 5W40 and Selenia K 5W40 are not fully synthetic. Selenia WR 5W30 Pure Energy and Selenia K 5W40 Pure Energy are fully synthetic. Plus, Selenia WR 5W40 can be safely used in the petrol engines , but Selenia K cannot be in the Multijets. ( For the ones who accidentaly put in wrong oils) Bottomline - If you want to give your engine the best , then Selenia is not the one. There are better ones avaiable. As of now the one oil i've found fully compatible with FIAT specifications ( FIAT 9.55535-N2 for diesels , FIAT 9.55535-M2/N2 for petrols) for its Multijets and Petrols is the fully synthetic Motul 8100 X-Cess 5W40. Going by the owners manual , this oil should not even void warranty if used. This oil can be run in both the Multijets as well as the petrols. Another for the Multijets - Shell Helix Diesel Ultra 5W40 I'm not too sure about Delvac 1 though. I'll keep updating the list of oils which comply with FIAT specifications whenever i come across one. Gurjinder.