I'm finding this thread an interesting read and now doubting my understanding of precisely what the +4 engines are. Is the new GDI a new engine based on the Duratec body (the 'old' engine being a Duratec DOHC L-4)and therefore still part of the Duratec family - ie it appears the same from the outside but the majority of the innards have been modified and it has direct injection. Is it's full title a 2.0 Ti-VCT GDI L-4 as used in Mazda? Puzzled now .....
