The Kia K5, specifically the 2.5 GDI variant introduced with the 2023 facelift and entering full production in February 2024, represents a key offering in Kia’s mid-size sedan lineup. Positioned as a mainstream choice within the K5 range, it slots between the base 1.6T engine option and the more performance-oriented GT trim. This variant aims to balance fuel efficiency, everyday usability, and a respectable level of performance for the average driver. The K5, known as the Optima in prior generations, underwent a significant redesign for the 2021 model year, and the 2023 facelift further refined its styling and technology. This particular 2.5 GDI Automatic configuration is primarily targeted at the North American market, where sedans with this level of performance and features remain popular.
Technical Specifications
| Brand | Kia |
| Model | K5 |
| Generation | K5 (facelift 2023) |
| Type (Engine) | 2.5 GDI (191 Hp) Automatic |
| Start of production | February, 2024 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan, Fastback |
| Seats | 5 |
| Doors | 4 |
| Fuel Type | Petrol (Gasoline) |
| Emission standard | SULEV 30 |
| Weight-to-power ratio | 7.7 kg/Hp, 130.4 Hp/tonne |
| Weight-to-torque ratio | 6 kg/Nm, 167.9 Nm/tonne |
| Power | 191 Hp @ 6100 rpm |
| Power per litre | 76.5 Hp/l |
| Torque | 246 Nm @ 4000 rpm, 181.44 lb.-ft. @ 4000 rpm |
| Engine layout | Front, Transverse |
| Engine Model/Code | THETA III |
| Engine displacement | 2497 cm3, 152.38 cu. in. |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 88.5 mm, 3.48 in. |
| Piston Stroke | 101.5 mm, 4 in. |
| Compression ratio | 13:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine systems | Start & Stop System |
| Kerb Weight | 1465-1540 kg, 3229.77 – 3395.12 lbs. |
| Max. weight | 1980 kg, 4365.15 lbs. |
| Max load | 440-515 kg, 970.03 – 1135.38 lbs. |
| Trunk (boot) space – minimum | 442 l, 15.61 cu. ft. |
| Fuel tank capacity | 60 l, 15.85 US gal | 13.2 UK gal |
| Length | 4905 mm, 193.11 in. |
| Width | 1859 mm, 73.19 in. |
| Height | 1445 mm, 56.89 in. |
| Wheelbase | 2850 mm, 112.2 in. |
| Front track | 1618-1633 mm, 63.7 – 64.29 in. |
| Rear (Back) track | 1626-1641 mm, 64.02 – 64.61 in. |
| Front overhang | 945 mm, 37.2 in. |
| Rear overhang | 1110 mm, 43.7 in. |
| Ride height (ground clearance) | 135 mm, 5.31 in. |
| Drag coefficient (Cd) | 0.27 |
| Minimum turning circle (turning diameter) | 11 m, 36.09 ft. |
| 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 | 8 gears, automatic transmission |
| Front suspension | Independent type McPherson |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs, 304.8 mm |
| Rear brakes | Disc, 284.48 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 205/65 R16 95H; 235/45 R18 94V |
| Wheel rims size | 6.5J x 16; 7.5J x 18 |
Powertrain & Engine Architecture
At the heart of the K5 2.5 GDI is the Hyundai-Kia Theta III engine family. This 2.497-liter (152.38 cubic inches) inline-four cylinder engine utilizes direct fuel injection (GDI) to maximize efficiency and power output. The engine boasts a relatively high compression ratio of 13:1, contributing to its performance. The Theta III engine is known for its durability and relatively simple design, making it a reliable choice for mainstream consumers. The engine is paired with an 8-speed automatic transmission, a modern unit designed for smooth shifting and optimized fuel economy. This transmission replaces the older 6-speed automatic found in earlier K5 models. The 8-speed offers closer gear ratios, allowing the engine to stay within its optimal power band more frequently. The Start & Stop System is standard, further enhancing fuel efficiency in city driving conditions.
Driving Characteristics
The 191 horsepower and 181.44 lb-ft of torque produced by the 2.5 GDI engine provide adequate performance for daily commuting and highway cruising. While not a sports sedan, the K5 2.5 GDI offers brisk acceleration, particularly when utilizing the transmission’s Sport mode. Compared to the more powerful GT trim, acceleration is noticeably slower, but the 2.5 GDI prioritizes fuel economy and a more relaxed driving experience. The 8-speed automatic transmission generally shifts smoothly, although some drivers may find it occasionally hesitant during quick downshifts. The gear ratios are tuned for efficiency, meaning the engine doesn’t rev as high as it could, prioritizing fuel savings over outright performance. Compared to the 1.6T engine, the 2.5 GDI offers a more linear power delivery and feels less strained at higher speeds.
Equipment & Trim Levels
The K5 2.5 GDI typically comes standard with a generous array of features. Base models generally include an 8-inch touchscreen infotainment system with Apple CarPlay and Android Auto compatibility, a suite of driver-assistance technologies (such as forward collision avoidance assist, lane keeping assist, and driver attention warning), and cloth upholstery. Higher trim levels add features like a larger 10.25-inch touchscreen, leather upholstery, a premium audio system, and a panoramic sunroof. Optional extras often include adaptive cruise control, a 360-degree camera system, and heated and ventilated front seats. Interior design is modern and relatively minimalist, with a focus on user-friendliness.
Chassis & Braking
The K5 utilizes a front-wheel-drive platform with an independent McPherson strut suspension in the front and an independent multi-link suspension in the rear. This suspension setup provides a comfortable ride quality, absorbing bumps and imperfections in the road effectively. Braking duties are handled by ventilated discs in the front and solid discs in the rear. Anti-lock braking system (ABS) is standard, along with electronic stability control. The chassis is tuned for comfort rather than outright handling prowess, but it provides predictable and stable behavior in most driving situations. Stabilizer bars are present at both the front and rear to reduce body roll during cornering.
Market Reception & Comparison
The Kia K5 2.5 GDI has been generally well-received by automotive critics, praised for its stylish design, spacious interior, and value for money. Fuel economy is competitive within its class, achieving around 27 mpg city and 37 mpg highway. Compared to other mid-size sedans like the Honda Accord and Toyota Camry, the K5 offers a more distinctive design and a more comprehensive suite of standard features at a similar price point. However, some critics have noted that the interior materials aren’t quite as premium as those found in its Japanese rivals. Reliability has been generally good, although long-term data is still emerging for the facelifted 2023 model.
Legacy
The Theta III engine family has proven to be a durable and reliable powerplant in numerous Hyundai and Kia vehicles. While not without its occasional issues (such as potential oil consumption in some earlier iterations), the engine is generally considered to be a solid performer. The 8-speed automatic transmission is also proving to be a reliable unit. In the used car market, the K5 2.5 GDI is expected to hold its value reasonably well, thanks to its attractive styling, comfortable ride, and reputation for reliability. As with any used vehicle, a thorough inspection and maintenance history check are recommended before purchase.
