Citroen Saxo Engine & Drivetrain Problems

the radiator fan stays on for a couple minutes when i switch the engine off

not really a problem just advice......which engine oil would be best for my car ,it has covered 106,000 miles...engine sound very smooth and quiet

i have a problem with my saxo not getting a spark have changed coilpack but still no spark what should i do

need the co down to pass the mot,the lamda sensor is ok,What should I do

my girlfriend has just topped the oil up on her car and the car has started to overheat after about 15 mile. I checked the oil and she has put too much in would this cause the over heating???