The Kia K8 3.5 Smartstream V6 LPi Automatic represents a significant offering in Kia’s sedan lineup, introduced in April 2021. Positioned as a premium trim within the K8 generation, this variant caters to buyers seeking a blend of performance, comfort, and fuel efficiency through the use of Liquefied Petroleum Gas (LPG). The K8, designed as a successor to the K7 (Cadenza in some markets), aims to provide a more sophisticated and spacious alternative in the mid-size sedan segment, primarily targeting the South Korean domestic market, with limited export availability. This specific configuration, combining the 3.5-liter V6 engine with an 8-speed automatic transmission and LPi fuel system, represents a unique powertrain choice within the K8 range.
Technical Specifications
| Brand | Kia |
| Model | K8 |
| Generation | K8 |
| Type (Engine) | 3.5 Smartstream V6 (240 Hp) LPi Automatic |
| Start of production | April, 2021 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 14.7-15.1 l/100 km (18.8 – 18.1 US mpg) |
| Fuel consumption (extra urban) | 10-10.4 l/100 km (23.5 – 22.6 US mpg) |
| Fuel consumption (combined) | 12.5-13 l/100 km (22.6 – 21.7 UK mpg) |
| CO2 emissions | 166-172 g/km |
| Fuel Type | LPG |
| Weight-to-power ratio | 6.8 kg/Hp |
| Weight-to-torque ratio | 5.2 kg/Nm |
| Power | 240 Hp @ 6000 rpm |
| Power per litre | 69.2 Hp/l |
| Torque | 314 Nm @ 4500 rpm (231.59 lb.-ft. @ 4500 rpm) |
| Engine layout | Front, Transverse |
| Engine displacement | 3470 cm3 (211.75 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Fuel injection system | Direct injection and Multi-port manifold injection |
| Engine systems | Start & Stop System |
| Kerb Weight | 1625-1670 kg (3582.51 – 3681.72 lbs.) |
| Fuel tank capacity | 64 l (16.91 US gal | 14.08 UK gal) |
| Length | 5015 mm (197.44 in.) |
| Width | 1875 mm (73.82 in.) |
| Height | 1455 mm (57.28 in.) |
| Wheelbase | 2895 mm (113.98 in.) |
| Front track | 1626 mm (64.02 in.) |
| Rear track | 1632 mm (64.25 in.) |
| Drivetrain Architecture | Front wheel drive |
| Number of gears | 8 |
| Gearbox type | Automatic transmission |
| Front suspension | Independent type McPherson |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 245/45 R18 |
| Wheel rims size | 18 |
Powertrain & Engine Architecture
The heart of the K8 3.5 LPi is Kia’s Smartstream G6DIII 3.5-liter V6 engine. This engine utilizes a combination of direct injection and multi-port fuel injection to optimize combustion efficiency and power delivery. The LPi (Liquefied Petroleum Gas) conversion allows the engine to run on propane or a similar LPG blend, offering reduced emissions compared to traditional gasoline engines, a key benefit in markets with stringent environmental regulations. The engine produces 240 horsepower at 6000 rpm and 314 Nm (231.59 lb-ft) of torque at 4500 rpm. The 8-speed automatic transmission, sourced from Hyundai Powertech, is designed for smooth and efficient gear changes. It features a wide gear ratio spread to balance acceleration and fuel economy. The transmission is electronically controlled, adapting to driving conditions and driver input.
Driving Characteristics
The K8 3.5 LPi Automatic delivers a comfortable and refined driving experience. While not overtly sporty, the 240 hp V6 provides ample power for everyday driving and highway cruising. The 8-speed automatic transmission contributes to smooth acceleration, although it may exhibit some hesitation during quick downshifts. Compared to potential turbocharged four-cylinder options within the K8 range, the V6 offers a more linear power delivery and a quieter engine note. The LPi fuel system doesn’t significantly impact performance, but it does alter the engine’s sound slightly. The front-wheel-drive configuration provides predictable handling, and the suspension is tuned for comfort rather than aggressive cornering.
Equipment & Trim Levels
The K8 3.5 LPi Automatic typically comes well-equipped, reflecting its position as a premium trim level. Standard features often include leather upholstery, a large touchscreen infotainment system with navigation, a premium sound system, automatic climate control, and a suite of advanced driver-assistance systems (ADAS) such as adaptive cruise control, lane-keeping assist, and automatic emergency braking. Optional extras could include a panoramic sunroof, ventilated front seats, and a head-up display. Interior trim levels vary, with higher-spec models offering more luxurious materials and finishes.
Chassis & Braking
The K8 utilizes a front-engine, front-wheel-drive layout. The front suspension employs an independent McPherson strut design, while the rear suspension features an independent multi-link setup. This configuration aims to provide a balance of ride comfort and handling stability. The braking system consists of ventilated discs at the front and solid discs at the rear, providing adequate stopping power for the vehicle’s weight. Anti-lock Braking System (ABS) is standard, enhancing safety during emergency braking situations. Steering is rack-and-pinion, offering precise and responsive control.
Market Reception & Comparison
The K8 3.5 LPi Automatic has been well-received in the South Korean market, where LPG vehicles are popular due to tax incentives and lower fuel costs. Critics have praised the K8’s spacious interior, comfortable ride, and refined powertrain. Compared to other K8 trims, the 3.5 LPi offers a more powerful and smoother driving experience than the base engine options. However, it may be less fuel-efficient than the turbocharged four-cylinder variants. The LPi conversion also adds to the initial cost of the vehicle, but the long-term fuel savings can offset this expense.
Legacy
The Kia K8 3.5 Smartstream V6 LPi Automatic represents a modern approach to the large sedan segment, combining a powerful V6 engine with the benefits of LPG technology. While its long-term reliability is still being established, Kia’s reputation for building durable and dependable vehicles suggests that this powertrain should prove to be relatively trouble-free. In the used car market, this variant is likely to appeal to buyers seeking a comfortable, well-equipped, and fuel-efficient sedan with a distinctive powertrain option. The K8’s success will depend on its ability to compete with established players in the mid-size sedan segment and to offer a compelling alternative to traditional gasoline-powered vehicles.
