The 2008 Kia Rio remains largely unchanged in this new model year and is available as a 4-door sedan in base, LX, and SX trims. First introduced in the U.S. in 1994, the entry-level Kia Rio is one of the lowest priced sedans sold in America. Affordably priced for budget-bound buyers, the Kia Rio is backed by one of the best powertrain warranties, 120 months/100,000 miles, in the auto market.