Requirements and purchase advice

Hello guys, I’m driving a Ford Focus BJ 2010 and he now has about 33,000km down. I bought this car in April 2011 because I was very dissatisfied with the Ford Focus BJ 1998 before, because there was always some defect. There was the offer to get for the old used 6,500€ list if you buy a new car. I accepted this offer so that I don’t have to go to the workshop all the time. With this new car I was now already 5 times in d last week I had my 2nd inspection, where I was then told that it is wet between the gear box halves and I can easily lose oil. I still have a year warranty on the car, but I no longer feel like the car. For this reason I decided now to re-examine myself and give this payment in order to buy me a new car again. I have to exclude a private sale, since my car is still in the financing and the ride I would tend to have a German mark. How would you act in my place?