I have a 2001 Ford Taurus and the factory recomended oil is 5w20. When I first look at it I thought it was 5w30. I now have 115,000 miles (not km) and have had no problems. It has never been low at the regular oil changes. I did have to have a tune up and the front brake pads replaced and the rotors smoothed out.
Never been a huge Ford fan but I'm happy with this one.
There are alot of ford focus owners out there experiencing a hot rod out the side of the block!! The 5w20 spec should be followed if its recommended by ford. Bearing cavitation eating conrod bearings is quite common in focus owners when they use thicker oil not speced for the tighter oil clearances.
As for taurus owners its very common for the brazilian made low quality aluminum heads to warp. The multi-layered head gaskets in some years are becoming high failure rates. The ends of the head start to tweek upwards creating an excess of .005 gap consuming coolant. If you take it to the ford dealerships I know alot of them will toque the heads tighter

this is with the non resurfaced heads coming in for headgasket jobs!!! ]