What should I do to my brake system in my car?

I have been in Iraq and upon coming home someone has put engine oil the master cylinder in 2004 Dodge Durango. Apparently from what I have been told I would have to replace the master cylinder, calipers, rubbers, and the steel lines and pretty much everything involved with the system. I was wondering if I could just bleed the system or just replace the master cylinder. What should I do?