The General Motors N platform (commonly called the N-body or N car) was a front-wheel drive compact automotive platform produced from 1984 to 2005. The GM N platform was based on the GM J-Body and replaced the GM X platform. First generation The N body was introduced in late 1984 for the 1985 model year. Initially, offered as the Pontiac Grand Am, Oldsmobile Calais and Buick Somerset coupes, GM positioned them as premium models at an affordable price. Standard in all models was the 2.5 liter "Iron Duke" 4 cylinder engine developed by the Pontiac Motor Division. Optional was the Buick built 3.0 liter V6 with multi-port fuel injection. All models could have a 5 speed manual or 3 speed automatic. During the 1986 model year, four door models were added to all three brand entries. The N platform was very similar to the GM L platform; however, the first generation N cars were engineered by Oldsmobile while the L cars were engineered by Chevrolet. The first generation used a twist-beam rear suspension and MacPherson struts in front, and featured a wheelbase. The N platform was used for the following vehicles: 1985–1991 Pontiac Grand Am 1985–1991 Oldsmobile Calais 1985–1987 Buick Somerset 1986–1991 Buick Skylark Second generation For the 1992 model year, General Motors heavily modified all of their N-Body offerings. The Oldsmobile Cutlass Calais was dropped in favor of the new Achieva, while the Buick Skylark and Pontiac Grand Am nameplates continued. In addition to new styling, this generation was longer and carried more distinctive sheet metal for each brand. The second generation N-Body continued until 1998 when it was replaced by the third and final generation. 1992-1998 Pontiac Grand Am 1992–1998 Oldsmobile Achieva 1992-1998 Buick Skylark Third generation (GMX130) In 1997 and 1998 General Motors consolidated the 2nd generation N platform with the GM A platform (FWD) and GM L platform during the corporately-engineered P-90 project which became known as GMX130. This automotive platform featured fully independent suspension and a wheelbase of . This was the last vehicle with significant engineering involvement of Oldsmobile and also the last one produced at the Lansing Car Assembly plant on April 29, 2004. A mid-size version spawned the 1997-2003 Chevrolet Malibu & Oldsmobile Cutlass of 1997-99, including the 2004-05 Chevrolet Classic. The GMX130 platform underpinned the following vehicles: 1999–2004 Oldsmobile Alero 1999–2005 Pontiac Grand Am 1997–1999 Oldsmobile Cutlass 1997–2003 Chevrolet Malibu 2004–2005