How can you tell what engine by trim level? That is, do all "ZX4" & "ZXW" have an engine with 16 valves? Can you tell if the car has the 130 hp or the 136 hp without looking at the engine for the ZTec inscription?
It varies from car to car alot. If you are not sure. Post an engine bay pic and we can surely tell you what you have. Is your exhaust on the front of your engine? Or the rear? Zetec=front Duratec = rear.