The Kia K5, formerly known as the Kia Optima, is a mid-size car manufactured by Kia since 2000 and marketed globally through various nameplates. First generation cars were mostly marketed as the Optima, although the Kia Magentis name was used in Europe and Canada when sales began there in 2002. For the second-generation models, Kia used the Kia Lotze and Kia K5 name for the South Korean market, and the Magentis name globally, except in the United States, Canada and Malaysia, where the Optima name was retained until the 2021 model year. The K5 name is used for all markets since the introduction of the fifth generation in 2019. First generation (MS; 2000) From 2000–2005, Optimas were a rebadged variant of the Hyundai Sonata, differing from the Sonata only in minor exterior styling details and equipment content. It was first shown in South Korea in July 2000 and was the first product of the Kia-Hyundai platform integration plan. In Australia, the Optima was introduced in May 2001, offered only with a 2.5 L V6 engine, and choice of manual or automatic transmission. The updated Optima was offered with a new 2.7 L engine, 4-speed automatic (the manual was dropped), and features such as full leather interior and alloy wheels were made standard. Thanks in part to better marketing, sales increased to 41,289 units in 2005, an all-time high. The Optima was sold until 2006, when it was replaced by the Magentis. Safety The 2001 Optima received Poor to Average ratings from the Insurance Institute for Highway Safety (IIHS). Update The 2002 Optima received a minor update. A luxurious version of the Optima was sold in South Korea as the "Optima Regal", using the 2-liter four or the 2.5-liter V6 only. The grille was redesigned for the United States in 2003 (2004 model year) to feature the Kia badge, and the headlamps were restyled for 2004 (2005 model year). Engines Second generation (MG; 2005) The second generation Optima, known as the Kia Magentis globally except in United States and Malaysia, and as the Kia Lotze in South Korea, was launched in South Korea in November 2005. This generation differed further from the Hyundai Sonata donor vehicle than the previous model. Unlike the previous Optima though, this vehicle uses a global platform, unique to Kia, designated "MG". The car continues to be built in South Korea and shares its 2.4-liter inline-four engine,