The Opel Astra K 1.6 CDTi (136 hp) ecoFLEX start&stop represents a significant iteration within the Astra K generation, produced from 2015 to 2018. Positioned as a fuel-efficient and practical option within the Astra K lineup, this variant aimed to balance performance with economy, appealing to drivers prioritizing lower running costs. It formed part of the broader Astra K range (A17), which represented a substantial redesign for the model, moving to a new lightweight platform and incorporating updated technology. This specific engine and trim level was a popular choice in European markets, where diesel engines held a strong presence due to favorable taxation and fuel efficiency.
Technical Specifications
| Brand | Opel |
| Model | Astra |
| Generation | Astra K |
| Type (Engine) | 1.6 CDTi (136 Hp) ecoFLEX start&stop |
| Start of production | 2015 |
| End of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Hatchback |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 4.4 – 4.6 l/100 km (53.5 – 51.1 US mpg, 64.2 – 61.4 UK mpg, 22.7 – 21.7 km/l) |
| Fuel consumption (extra urban) | 3.4 – 3.5 l/100 km (69.2 – 67.2 US mpg, 83.1 – 80.7 UK mpg, 29.4 – 28.6 km/l) |
| Fuel consumption (combined) | 3.8 – 3.9 l/100 km (61.9 – 60.3 US mpg, 74.3 – 72.4 UK mpg, 26.3 – 25.6 km/l) |
| CO2 emissions | 103 – 99 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 9.6 sec |
| Acceleration 0 – 62 mph | 9.6 sec |
| Acceleration 0 – 60 mph | 9.1 sec |
| Maximum speed | 205 km/h (127.38 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 9.4 kg/Hp, 105.8 Hp/tonne |
| Weight-to-torque ratio | 4 kg/Nm, 249 Nm/tonne |
| Power | 136 Hp @ 3500-4000 rpm |
| Power per litre | 85.1 Hp/l |
| Torque | 320 Nm @ 2000-2250 rpm (236.02 lb.-ft. @ 2000-2250 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | B16DTH |
| Engine displacement | 1598 cm3 (97.52 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 79.7 mm (3.14 in.) |
| Piston Stroke | 80.1 mm (3.15 in.) |
| Compression ratio | 16:1 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Engine oil capacity | 5 l (5.28 US qt | 4.4 UK qt) |
| Kerb Weight | 1285 kg (2832.94 lbs.) |
| Max. weight | 1875 kg (4133.67 lbs.) |
| Max load | 590 kg (1300.73 lbs.) |
| Trunk (boot) space – minimum | 370 l (13.07 cu. ft.) |
| Trunk (boot) space – maximum | 1210 l (42.73 cu. ft.) |
| Fuel tank capacity | 48 l (12.68 US gal | 10.56 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Permitted trailer load with brakes (12%) | 1500 kg (3306.93 lbs.) |
| Permitted trailer load without brakes | 650 kg (1433 lbs.) |
| Length | 4370 mm (172.05 in.) |
| Width | 1809 mm (71.22 in.) |
| Width with mirrors folded | 1871 mm (73.66 in.) |
| Width including mirrors | 2042 mm (80.39 in.) |
| Height | 1485 mm (58.46 in.) |
| Wheelbase | 2662 mm (104.8 in.) |
| Front track | 1548 mm (60.94 in.) |
| Rear (Back) track | 1565 mm (61.61 in.) |
| Minimum turning circle | 11.05 m (36.25 ft.) |
| Drivetrain Architecture | Front wheel drive |
| Drive wheel | Front wheel drive |
| Number of gears and type of gearbox | 6 gears, manual transmission |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
INTRODUCTION
The Opel Astra K 1.6 CDTi (136 hp) ecoFLEX start&stop, launched in 2015, was a key variant in the Astra K range. It was designed to appeal to buyers seeking a balance between fuel efficiency, reasonable performance, and practicality. The ‘ecoFLEX’ designation indicated Opel’s efforts to optimize fuel economy through various technologies, including start&stop functionality and aerodynamic enhancements. This model occupied a mid-range position within the K Astra lineup, slotting in below the more powerful petrol and diesel options, and above the base-level engine choices. It was primarily marketed in Europe, where diesel engines were favored for their fuel economy and lower running costs.
Powertrain & Engine Architecture
At the heart of the Astra K 1.6 CDTi ecoFLEX is the B16DTH engine, a 1.6-liter inline-four cylinder diesel. This engine is part of Opel’s ‘Whisper Diesel’ family, known for its relatively quiet operation compared to older diesel designs. The B16DTH utilizes a common rail direct injection system, delivering fuel directly into the combustion chamber at extremely high pressure for optimized combustion. A turbocharger with intercooling is employed to boost power output and improve torque across a wider rev range. The engine also features a diesel particulate filter (DPF) to reduce harmful emissions, complying with Euro 6 standards. The 136 hp output is achieved at 3500-4000 rpm, while the peak torque of 320 Nm (236 lb-ft) is available from 2000-2250 rpm. This engine was paired with a six-speed manual transmission, optimized for fuel efficiency. The transmission’s gear ratios were selected to keep the engine operating within its most efficient range during typical driving conditions.
Driving Characteristics
The 1.6 CDTi (136 hp) Automatic Astra K offered a comfortable and refined driving experience, prioritizing fuel economy over outright performance. Acceleration from 0-60 mph took approximately 9.1 seconds, which was adequate for everyday driving but not particularly sporty. The engine provided sufficient torque for effortless cruising and overtaking, but it lacked the punch of the higher-output diesel variants. The six-speed manual transmission allowed for precise gear selection, and the gear ratios were well-matched to the engine’s torque curve. Compared to the more powerful 1.6 CDTi (163 hp) version, the 136 hp model felt noticeably less responsive, especially at higher speeds. However, the lower power output also translated to improved fuel economy. The suspension setup provided a good balance between comfort and handling, absorbing bumps and imperfections in the road while maintaining a stable and controlled feel.
Equipment & Trim Levels
The Astra K 1.6 CDTi ecoFLEX start&stop was typically offered in several trim levels, including ‘Essentia’, ‘Enjoy’, and ‘Elegance’. The base ‘Essentia’ trim included standard features such as air conditioning, electric front windows, a basic audio system, and stability control. The ‘Enjoy’ trim added features like alloy wheels, cruise control, and a more advanced infotainment system. The top-of-the-line ‘Elegance’ trim included luxuries such as leather upholstery, automatic climate control, and parking sensors. Optional extras available for this variant included a panoramic sunroof, heated seats, and a navigation system. Interior upholstery was typically cloth on the lower trims, with leather options available on the higher trims. The dashboard layout was modern and ergonomically designed, with a central touchscreen display controlling many of the vehicle’s functions.
Chassis & Braking
The Astra K utilized a lightweight chassis construction, incorporating high-strength steel to reduce weight and improve rigidity. The front suspension featured MacPherson struts, while the rear suspension employed a torsion beam setup. This configuration provided a good balance between ride comfort and handling. The braking system consisted of ventilated discs on the front wheels and solid discs on the rear wheels. Anti-lock braking system (ABS) and electronic stability control (ESC) were standard features, enhancing safety and control. The steering system was a rack-and-pinion type, providing precise and responsive steering feel. Tire sizes varied depending on the trim level, with 195/65 R15 and 205/55 R16 being common options.
Market Reception & Comparison
The Opel Astra K 1.6 CDTi (136 hp) ecoFLEX start&stop received generally positive reviews from automotive critics. It was praised for its fuel efficiency, comfortable ride, and refined engine. However, some critics noted that the engine lacked the performance of its more powerful counterparts. Compared to the 1.6 CDTi (163 hp) version, the 136 hp model offered slightly better fuel economy but noticeably slower acceleration. Against competitors like the Volkswagen Golf and Ford Focus, the Astra K 1.6 CDTi offered a competitive package in terms of fuel efficiency and value for money. Its real-world fuel economy consistently hovered around 60 mpg, making it an attractive option for drivers covering long distances.
Legacy
The Opel Astra K 1.6 CDTi (136 hp) ecoFLEX start&stop has proven to be a reliable and durable powertrain. The B16DTH engine is known for its longevity, provided it is properly maintained. Common issues include DPF clogging (particularly with frequent short journeys) and occasional injector problems. In the used car market, this variant remains a popular choice due to its fuel efficiency and affordability. It represents a practical and economical option for buyers seeking a reliable family hatchback. The Astra K, in general, helped to solidify Opel’s reputation for building well-engineered and fuel-efficient vehicles.
