PH1 Silvertop Zetec 2.0 in our Fiesta is losing oil like nothing I've seen. Huge puddle of oil underneath car/dripping aswell as it being blown out the cam cover breather. Is it possible the headgasket can leak externally? (no signs of mayo or bubbling coolant) but the car for some reason smokes ONLY in 4th gear around 5k rpm and power loss. Not sure if cat is on it's way out as it started popping after the smoke. The smoke also enters the car inside as if the cat is red hot. Any typical leaks for Zetec other than cam cover? Can't see any noticeable leaks from cam cover, but it's all over the bellhousing and is dripping down from this side. Any ideas what could cause the leak and the oil to be blown out of the breather? Yesterday it managed to nearly lose a liter of oil in only 12-15 miles. There was oil on the lip of the cylinder head where it meets the block and the head hangs over a bit gearbox end which may have leaked down from cam sensor? Could a headgasket leak externally this fast? Could it be cam position sensor? Engine has supposedly been rebuilt 8k ago including pistons and rings...It also idles a little erratically if left to idle for a while, starts hunting and then cuts out. Idle control valve maybe? I've spent £440 on the engine and 2 days worth swapping the old lump out and putting this one in, seller also won't refund because "I've thrashed it" but I needed to see when it smokes and where it leaks etc. Anybody have any answers?