Oils are getting complicated, Joe, as are engines. I think that the eventual idea from the manufacturers is that they sell you a car, and when it breaks down, they exchange it for another. All you will have to do is give them some more cash. My Canon Printer which I bought 15 months ago is now obsolete. It had an error code, and I took it in to Currys, and as I had taken out repair or replacement warranty, they offered to replace it. The problem was that they did not have a similar model to replace it with. They will have one somewhere that I can get, but odds on it will be £60 dearer than mine was. Peter.