I think the drive shaft seal is slightly leaking on my 2005 Focus and needs replacing. Its a Focus 2005 1.6 16v Petrol, 5 Door, Zetec with about 55,000 miles. Is this common for a car of this mileage? I have attached a few photos after having a look for myself. You can see the damp patch and its causing 3 to 4 drops of oil on the drive each evening, so it seems its on it way out. I does not seem like a job i can do myself on the drive, what sort of repair bill would be reasonable to replace this seal and is there any other seals worth changing while this work is being done? Many Thank