Mercedes-Benz introduced the W123 generation of their E-Class for the 1977 model year. The successor to the W114 & W115, the W123 was a series of mid size luxury cars available as Sedans (W123), Coupes (C123), or Wagons (S123). A long wheelbase version of the sedan known as the V123 Limousine was also offered. Well known for their over-engineered and highly reliable nature, W123 cars were massively popular, with over 2.7 million examples sold. These cars were offered with a range of inline 4, inline 5, or inline 6 engines, and were produced until 1986, when they were replaced by the Mercedes-Benz W124. AMG also developed and offered On-site customization or kits developed to upgrade the Sedan, Coupe or Wagon body styles. The W123 AMG are becoming nowadays very sought after and valuable depending on their authenticity.