Mobil just sent me a very interesting book on synthetic oil. It contains questions, answers, and technical information. The book really answers a lot of questions I see on this forum on a regular basis.<p>What I find is that a lot of people are mis-informed about oils especially in the dealerships and garages.<p>I'd be happy to answer questions if you e-mail me.<p>The book is 26 pages long, so to large to post here and probably to long for the FAQ section. It is however very informative.<p>I use Mobil1 in my A4 Avant, right from the first day. We also are a Mobil Distributor, We cannot ship oil so therefore do not offer it over the web.<p>Mobil has a good web site and perhaps you can order this book for yourself from them<p>the part # is 05FL068BR-RETAIL<p>Other manufacturers, such as Castrol probably have similar information available.