The Kia Optima, in its first generation (introduced in 2000 and facelifted in 2003), marked Kia’s ambitious entry into the competitive mid-size sedan segment. The 2003 facelift brought with it revised styling and refinements to the original design. Among the engine options available, the 1.8-liter, 134 horsepower variant paired with a four-speed automatic transmission occupied a crucial position as the entry-level offering in many markets, particularly in Europe and Asia. This configuration aimed to provide a balance of affordability, reasonable performance, and ease of use for a broad customer base. Production of this specific combination ran from 2003 to 2005.
Technical Specifications
| Brand | Kia |
| Model | Optima |
| Generation | Optima I (facelift 2003) |
| Type (Engine) | 1.8 (134 Hp) Automatic |
| Start of production | 2003 |
| End of production | 2005 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel Type | Petrol (Gasoline) |
| Maximum speed | 190 km/h (118.06 mph) |
| Weight-to-power ratio | 10.5 kg/Hp, 95.4 Hp/tonne |
| Weight-to-torque ratio | 8.3 kg/Nm, 120.3 Nm/tonne |
| Power | 134 Hp @ 6000 rpm |
| Power per litre | 73 Hp/l |
| Torque | 169 Nm @ 4500 rpm (124.65 lb.-ft. @ 4500 rpm) |
| Engine layout | Front, Transverse |
| Engine displacement | 1836 cm3 (112.04 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 81.5 mm (3.21 in.) |
| Piston Stroke | 88 mm (3.46 in.) |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Kerb Weight | 1405 kg (3097.49 lbs.) |
| Trunk (boot) space – minimum | 385 l (13.6 cu. ft.) |
| Fuel tank capacity | 65 l (17.17 US gal | 14.3 UK gal) |
| Length | 4745 mm (186.81 in.) |
| Width | 1815 mm (71.46 in.) |
| Height | 1420 mm (55.91 in.) |
| Wheelbase | 2700 mm (106.3 in.) |
| Front track | 1540 mm (60.63 in.) |
| Rear (Back) track | 1530 mm (60.24 in.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the front wheels of the vehicle. |
| Drive wheel | Front wheel drive |
| Number of gears and type of gearbox | 4 gears, automatic transmission |
| Front suspension | Wishbone |
| Rear suspension | Coil spring |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 195/70 R14 |
| Wheel rims size | 14 |
Powertrain & Engine Architecture
The heart of this Optima variant is the Kia-developed 1.8-liter inline-four cylinder engine, internally designated with various codes depending on the specific market. This engine utilizes a naturally aspirated configuration, relying on atmospheric pressure for air intake. It features a double overhead camshaft (DOHC) valvetrain, operating four valves per cylinder, which contributes to improved breathing and efficiency. Fuel delivery is managed by a multi-port fuel injection system, providing precise fuel metering for optimal combustion. The engine produces 134 horsepower at 6000 rpm and 169 Nm (124.65 lb-ft) of torque at 4500 rpm. This power is then channeled through a four-speed automatic transmission to the front wheels. The transmission was chosen for its ease of use and accessibility, appealing to drivers prioritizing comfort over sporty performance.
Driving Characteristics
The 1.8L automatic Optima offered a comfortable, if not particularly exhilarating, driving experience. The four-speed automatic transmission, while smooth, lacked the responsiveness of a manual gearbox or more modern automatic transmissions with additional gears. Acceleration was adequate for everyday driving, but overtaking maneuvers required careful planning. The gear ratios were tuned for fuel efficiency rather than outright performance. Compared to the higher-output engines available in the Optima range, such as the 2.0-liter or 2.4-liter options, this variant felt noticeably less powerful. However, it provided a more relaxed and fuel-efficient driving experience, making it well-suited for urban commuting and long highway journeys.
Equipment & Trim Levels
The 1.8-liter automatic Optima typically served as the base trim level. Standard features generally included air conditioning, power windows, power locks, and a basic audio system. Interior upholstery was typically cloth, and the dashboard featured a straightforward design with easy-to-use controls. Optional extras, depending on the market, could include alloy wheels, a sunroof, upgraded audio systems, and side airbags. The focus was on providing essential features at an affordable price point.
Chassis & Braking
The Optima’s chassis employed a front wishbone suspension and a rear coil spring suspension, providing a comfortable ride quality. The front brakes were ventilated discs, offering good stopping power, while the rear brakes were solid discs. Anti-lock Braking System (ABS) was standard, enhancing safety by preventing wheel lockup during hard braking. The steering system utilized a rack and pinion setup with hydraulic power assistance, providing responsive and precise steering feel. The vehicle rode on 14-inch wheels with 195/70 R14 tires.
Market Reception & Comparison
The 1.8-liter automatic Optima was generally well-received as an affordable and practical mid-size sedan. Critics praised its comfortable ride, spacious interior, and reasonable fuel economy. However, some reviewers noted its lack of performance compared to competitors and higher-trim Optima models. In terms of fuel economy, it generally outperformed the larger-engined variants, making it an attractive option for budget-conscious buyers. Reliability was generally considered good, although routine maintenance was essential to ensure long-term durability.
Legacy
The 1.8-liter automatic Kia Optima, while not the most powerful or technologically advanced version of the car, played a significant role in establishing Kia as a credible competitor in the mid-size sedan market. Its affordability and practicality made it a popular choice for families and commuters. Today, these vehicles can be found on the used car market at very affordable prices. While the engine and transmission are generally reliable, potential buyers should be aware of the need for regular maintenance, including timing belt replacement (if applicable) and fluid changes. The 1.8L Optima represents a solid, if unspectacular, entry point into the world of Korean automotive engineering.
