I don't know yet.
I just had it in for an oil change/inspection at the dealership, so that I could have this issue documented. I was hoping that I was crazy and that the seals weren't leaking, but sadly, they are. Now I have it documented at least.
The reason I haven't decided if I want to deal with it or not is because I may just get rid of the car rather than try to deal with Fords bullshit customer service and service departments. I already had the car in due to loud/chattery and weak clutch, which they claim is "normal" and within spec (I have one inch of play to feather the clutch) at 20K miles. Why try to deal with warranties when they are complete bullshit, and only honored when the tech/shop manager is having a good day? I'm concerned that as time goes on, more issues are going to crop up past my warranty period and then I'll be completely out of luck.
I asked the tech today how often they see vehicles come in with leaking axle seals at 20K miles, and he said never. Clearly this car has either quality control issues, or a fair amount of us simply have lemons. I've read of enough people having fairly major problems to scare me off. I need a car that will last me. Not one that will be breaking down at 50K miles.
I LOVED this car. I was eagerly awaiting the day for the FiestaST to hit the sales floors, and picked one up as soon as I could. I am regretting that decision, and regretting owning a Ford.
end rant.