As I was walking to my car in the morning, I noticed that there was a bit of oil on the front passenger side wheel. I decided to wipe up the oil and go for a drive; after driving around for maybe 30 minutes I headed home and checked it again. No oil residue anywhere. My concern is that this could be brake fluid that's leaking. My car only has about 1700 miles on it, and I haven't done any modifications to the car. I want to know if this is a common problem that I could fix myself, or if this is something that I need my local dealership to take a look into. I would really appreciate if someone could give me insight into what's going on. I'll let the car sit overnight and check it again in the morning to see if there's any more oil on the wheel.