My Z4 has a full main dealer history and I quite fancied keeping it that way whilst trying to keep the costs down. It needs an oil service so I called Peter Vardy and asked for a price if I supplied my own oil and filter which I had already purchased. £189 if they supply the oil and £156 if I do but they wont stamp the book as they didn't use BMW parts. What a rip off. I could easily save £156 by doing it myself.