The 5 Series got its name by being the fifth of the "new series" cars after the V-8 and Isetta era. The preceding models were the 700, the "New Class", the "New Six" 2500/2800/Bavaria and the CS. The 5 Series was intended to replace the smaller New Class sedans, leaving the coupes as the company's low-end model. The body was styled by Marcello Gandini, based on the Bertone 1970 BMW Garmisch 2002ti Geneva show car. Gandini also did the Fiat 132 and Alfa Romeo Alfetta, two other cars that have a similar design. There have been five generations of the 5 Series to date. To differentiate between them, they are referred to by their unique chassis numbers (EXX). The 5 Series began the BMW tradition of being named with a three-digit number. The first digit (5 in this case) represents the model, and the following two digits (usually) represent the size of the engine in decilitres, which is the main distinguishing difference. Additional letters or words may be added to the end of the three-digit number to define the fuel type (petrol or diesel), engine or transmission details, and the body style. The 'i' originally stood for (fuel) 'injection'. The BMW E28 was the second BMW 5 Series, a stylistic evolution of the E12. The following models were sold in Europe: * 518/518i- 1.8 L M10B18 * 520i - 2.0 L M20B20 I6 524d - 2.4 L M21 diesel I6 * 524td - 2.4 L M21 turbodiesel I6 * 525i - 2.5 L M30B25 I6 * 525e - 2.7 L M20B27 I6 High performance 5 Series - 24-valve DOHC, I6, six throttle bodies, Bosch Motronic integrated fuel injection. At its launch in 1984, the European specification E28 M5 was the fastest production sedan in the world. Visible changes to this model included revised headlights, Thicker rubber bumper surrounds and large rectangular taillights. The shape was more box shaped than rounded at the rear. Awards The E39 5 Series was on Car and Driver magazine's annual Ten Best list for six years straight, from its introduction in 1997 through 2002. It was also Motor Trend's Import Car of the Year for 1997 and What Car? Executive Car of the Year 1997 through 2002. The E60 was named "Best New Luxury / Prestige Car" in the 2006 Canadian Car of the Year awards. Active Seat  continuous passive motion seating comfort technology recognized as one of the Best Inventions of 1998 by Popular Science magazine. Consumer Reports found the E39 5 series their best car tested in 2001-2002.