2015-2018 Kia Optima IV 1.7 CRDi (141 Hp)

The Kia Optima IV 1.7 CRDi (141 hp) was a diesel-powered variant of the fourth-generation Kia Optima, produced from 2015 to 2018. Positioned as a fuel-efficient option within the Optima lineup, it primarily targeted European and Asian markets where diesel engines were more prevalent. This model represented Kia’s continued effort to offer a compelling mid-size sedan with a focus on economy and practicality. It was built on the TF platform (internally designated as the ‘HF’ platform), shared with the Hyundai Sonata of the same era.

Technical Specifications

INTRODUCTION

The Kia Optima IV 1.7 CRDi, produced between 2015 and 2018, was a key variant in the fourth generation of Kia’s popular mid-size sedan. Designed to appeal to buyers seeking fuel efficiency without sacrificing comfort or practicality, this model utilized a 1.7-liter turbocharged diesel engine. It was primarily sold in Europe and Asia, where diesel fuel was more readily available and economically advantageous. The Optima IV, in general, represented a significant step forward for Kia in terms of design, build quality, and features, and the 1.7 CRDi trim aimed to deliver a compelling value proposition within that framework.

Powertrain & Engine Architecture

The heart of the Optima IV 1.7 CRDi is the U II / D4FD engine, a 1.7-liter inline-four cylinder diesel. This engine is a turbocharged common-rail direct injection (CRDi) unit, meaning fuel is delivered directly into the cylinders at extremely high pressure for optimized combustion. The engine utilizes a variable geometry turbocharger (VGT) and an intercooler to enhance power and efficiency. The D4FD engine boasts a relatively high compression ratio of 15.7:1, contributing to its thermal efficiency. The engine is equipped with a double overhead camshaft (DOHC) valvetrain with four valves per cylinder. The 6-speed manual transmission was standard, providing a balance between fuel economy and driver engagement. While an automatic transmission was offered in some markets with other engine options, the 1.7 CRDi was predominantly paired with the manual gearbox.

Driving Characteristics

The 141 hp and 340 Nm (250.77 lb-ft) of torque produced by the 1.7 CRDi engine provided adequate performance for everyday driving. Acceleration from 0-60 mph took approximately 9.5 seconds, and top speed was rated at 203 km/h (126.14 mph). The engine’s peak torque was available from 1750-2500 rpm, offering good responsiveness in typical driving situations. Compared to the higher-output gasoline engines available in the Optima IV range, the 1.7 CRDi prioritized fuel economy over outright speed. The manual transmission allowed for greater driver control, but the gear ratios were tuned for efficiency rather than sporty performance. The 1.7 CRDi felt less strained during highway cruising than the base gasoline engines, thanks to the diesel’s inherent torque advantage.

Equipment & Trim Levels

The 1.7 CRDi trim level typically represented a mid-range offering in the Optima IV lineup. Standard equipment generally included air conditioning, power windows and mirrors, a basic audio system with USB connectivity, and alloy wheels. Safety features such as ABS, Electronic Stability Control (ESC), and multiple airbags were also standard. Higher trim levels added features like leather upholstery, a touchscreen infotainment system with navigation, a rearview camera, and parking sensors. Optional extras included a panoramic sunroof, heated seats, and advanced driver-assistance systems (ADAS) such as lane departure warning and automatic emergency braking, depending on the market.

Chassis & Braking

The Optima IV featured a front-wheel-drive layout with an independent McPherson strut suspension in the front and a multi-link double wishbone suspension in the rear. This suspension setup provided a comfortable ride quality while maintaining reasonable handling characteristics. The 1.7 CRDi models typically used ventilated disc brakes in the front and solid disc brakes in the rear. The steering was electrically assisted, providing light and precise control. The chassis was tuned to prioritize comfort and stability, rather than outright sportiness.

Market Reception & Comparison

The Kia Optima IV 1.7 CRDi was generally well-received by automotive critics for its fuel efficiency and value for money. It offered a compelling alternative to other mid-size sedans, particularly in markets where diesel engines were popular. Compared to the gasoline-powered Optima variants, the 1.7 CRDi delivered significantly better fuel economy, making it an attractive option for high-mileage drivers. However, some critics noted that the engine could be somewhat noisy and lacked the refinement of some of its competitors. Compared to other diesel-powered sedans in its class, the Optima 1.7 CRDi offered a competitive level of equipment and a longer warranty, which contributed to its appeal.

Legacy

The Kia Optima IV 1.7 CRDi has proven to be a relatively reliable powertrain in the used car market. The D4FD engine is known for its durability, and with proper maintenance, it can provide many years of service. However, like all diesel engines, it is important to ensure regular servicing, including oil changes and filter replacements. The Optima IV, in general, has gained a reputation for being a well-built and practical mid-size sedan, and the 1.7 CRDi variant remains a popular choice for buyers seeking a fuel-efficient and affordable vehicle.