I recently purchased a 2015 DS3 from a garage and noticed it was drinking oil within a couple of weeks of driving it. I have returned it to the garage who have had it for a few weeks testing, and have said it needs a new engine. This is under the waranty I purchased at the time. Unfortunately they have now said they cannot get a delivery date for one and that it may take months. They have said they want to buy my car back, However, they are trying to deduct cost for the 1,300 miles I have covered. I have argued that as it was sold with a fault I should be due a full refund as I will be out of pocket and am struggling to find a similar car at that price. Can you advise what my rights are? Can I simply say to carry on with the engine replacement and I will just hold on to their courtesy car?