Right.Lets try to get this sorted once and for all.Manual says 5/40.HOWEVER i have contacted fiat uk customer services who got someone from there technical dept.to give me a ring back.He said that the oil grade required for this engine is now5/30 with a c2 rating and NOT as the manual states,the 5/40.Bloke was very helpfull and also said the c2 rating was important as well and not to mix it with other fully syn oil.Obviously recomended selenia 5/30 wr but said whatever brand i chose make sure it has the c2 rating and dont mix with a c3 rated oil.Hope this helps any others searching for that elusive definitive answer!