Right to reject used car?

If there's a problem with a second hand car soon after you’ve bought it, for example, the car develops a problem you wouldn’t expect for the car’s age and mileage, or it turns out to be not what you’d been lead to expect, you may have the right to ‘reject’ the car and get your money back.

However, you have only a ‘reasonable’ time to reject a second hand car. There’s no clear definition of what a reasonable time is – you probably need to do it within three or four weeks of buying it. But if you reject a second hand car you must stop using it. And if the fault is very obvious you may have less time.

After six months, it would be difficult to prove that the fault has not developed in the time you have had it, regardless of the few miles you have driven. I would accept the repair. Oil leaks can have many causes and few of them mean something intrinsically wrong with the car. I don't think you have a case for a refund in this instance. Sorry - perhaps another forumee can be more positive!