For more than 25 years, informed BMW owners have relied on Roundel, the magazine of the BMW Car Club of America, to make their "Ultimate Driving Machines" more ultimate. Now a selection of articles on driving, performance, service and tech tips have been collected in a single book. Whether you drive a sporting 325iC or the uncompromising 850CSi Sport Coupe, this book will serve as a valuable maintenance guide, performance handbook and technical reference source, to help you understand and care for your BMW. BMW owners and BMW Car Club of America members provide specific information for your BMW: -Valuable insights and technical information ranging from basic service tips to advanced driving theory-written by BMW owners and club members specifically for BMW cars. -Inside secrets on maintaining, preserving and caring for your BMW. Find out how to properly wash and wax your car without damaging the paint, and how to reset the service indicator lights. -Driving techniques ranging from basic car control to choosing apexes on the track. Discover whether your car understeers or oversteers, and how weight transfer affects traction and vehicle dynamics. -Learn the difference between torque and horsepower, how to select the right tires for your BMW, which performance modifications work and which ones don't. Organized and indexed for quick access and easy use, this book contains extensive driving and performance tuning information. Favorite articles and series are bundled together, such as On Driving and Shade Tree Topics. "BMW Enthusiast's Companion" is a must-have for all BMW owners and enthusiasts.