Current Kia Optima models, which are marketed as the Kia K5 in many regions, use four-cylinder engines exclusively. There is no factory six-cylinder option in today’s lineup. Some earlier generations offered other configurations in select markets, but modern Optimas are four-cylinder only.
This article outlines the present engine options and explains how engine choices have evolved across generations, helping readers understand what to expect when shopping for a current or used Optima/K5.
Current engine options in the Optima/K5 lineup
The following four-cylinder powertrains are typical in recent Optima/K5 models, including performance-oriented variants.
- 1.6-liter turbocharged inline-4 (1.6L turbo) — a compact, responsive turbo option used across multiple trims.
- 2.5-liter inline-4 — a naturally aspirated four-cylinder providing standard performance and efficiency.
- 2.5-liter turbocharged inline-4 — a higher-performance turbo option available in the GT variant, delivering stronger acceleration.
Across the current lineup, all engines are four-cylinder units, aligning with Kia’s focus on efficiency and smooth power delivery.
Historical context: engine options over the years
Engine choices for the Optima have varied by generation and market. While today’s cars are four-cylinder only, some older versions were offered with different configurations in select regions.
- A V6 option appeared in a limited number of older Optima variants in certain markets, but it was not part of the broad current lineup.
- Modern-era Optimas (and the K5 in many markets) have emphasized four-cylinder powertrains, including turbocharged and naturally aspirated four-cylinders.
If you’re shopping for a used Optima, check the exact engine code under the hood or in the vehicle history to confirm the engine. The general rule today is four cylinders, with no current factory V6 option.
Summary
The Kia Optima, now marketed as the Kia K5 in many regions, is powered by four-cylinder engines across the current lineup. While older generations in some markets offered different configurations, there is no factory six-cylinder option in today’s Optima/K5 lineup. For buyers, the key takeaway is to verify the specific engine in the vehicle you’re considering, but you should expect four cylinders in today’s models.