about 4weeks ago i bought a y reg vectra estate for £1100, the car was advertised as excellent condition, however 2 days after having the car i noticed that when revved over 4500rpm it blows a big cloud of smoke, i notified the dealer but they said its just because it needed driving hard, i've now noticed it uses a lot of oil(over 2.5litres for just over 900miles. Although the person i bought the car off buys cars from main dealers to sell on(they normally have 5+ cars on ebay at any one time) they're trying to claim they are a private seller, even though their name does not appear on the log book. Its now 4weeks since i bought car, do i have any rights as i did inform them of the problem within 2days of having the car?