I take it the car was sold as seen?
I had a coolant leak and an oil leak on mine, in fact I was lied to about the oil leak with the dealer saying although the mot noted it on the advisories he found it to be an oil breather pipe that needed 'nipping' up, so was now fine. Problem was that it was sold as seen as I'd knocked him down a fair bit, which was a good job as the work cost me £600 to put both leaks right.
I put it down to experience and me being eager to get my hands on that 3.2. I should have checked it properly myself or had it looked over BEFORE I handed over the money. I would imagine that as your issue is not major, i.e the car still works fine that you have little ground to stand on, although it is always worth a call....
3.2GT V6 - Gabbiano Blue - M-Tec Shortshifter - Wizard Cat Back - Rest standard