your radiator needs to be replaced
Normally a sign of a coolant leak in the oil cooler. Replace ASAP.
A Ford Focus needs anywhere from 4.5 to 6 quarts of motor oil. The Ford Focus was fist produced in 1998.
A four cylinder 2009 Ford Focus hold 4.5 quarts of oil.
According to the 2002 Ford Focus Owner Guide : ( 5W-20 ) engine oil is recommended
There are two possibilities, one it is most likely the automatic transmission cooler( in the radiator) is leaking transmission fluid. The other, engine is oil entering the cooling system through a leaking headgasket, cracked cylinderhead or engine block.Keep in mind that the engine oil pressure( normally) is allways higher than that of the coolant system , when engine is running.It is rare but possible that engine oil @ say 40 p.s.i. is entering the coolant system, but when the engine is shut off the coolant system pressure is not high enough to leak into the engine oil .It is not uncommon for(in radiator) transmission coolers to leak oil into the coolant system.
In the oil pan, in the engine.
if it is a new ford focus then no, alot of new cars have regulators on them.
Yes.
diesel
No
The exclamation light, on your Ford focus, is a reference to the oil needs to be changed. The light can be reset by changing the oil.
Remove oil pan