The Vauxhall Astra Mk VI GTC 2.0 CDTi, produced from 2011 to 2015, represented a sporty and efficient offering within the broader Astra Mk VI (J) range. Positioned as a coupe variant (GTC standing for Gran Turismo Coupe) of the Mk VI Astra, it aimed to provide a more dynamic driving experience and a sleeker aesthetic compared to the five-door hatchback and estate models. This particular 2.0 CDTi variant, boasting 165 horsepower, occupied a mid-range position in the GTC lineup, offering a balance between performance and fuel economy. It was a key model for Vauxhall in the European market, competing with rivals like the Ford Focus Coupe and Volkswagen Scirocco.
Technical Specifications
| Brand | Vauxhall |
| Model | Astra |
| Generation | Astra Mk VI GTC |
| Type (Engine) | 2.0 CDTi (165 Hp) |
| Start of production | 2011 |
| End of production | 2015 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Hatchback |
| Seats | 5 |
| Doors | 3 |
| Fuel consumption (urban) | 5.7 l/100 km (41.3 US mpg, 49.6 UK mpg, 17.5 km/l) |
| Fuel consumption (extra urban) | 4.3 l/100 km (54.7 US mpg, 65.7 UK mpg, 23.3 km/l) |
| Fuel consumption (combined) | 4.8 l/100 km (49 US mpg, 58.9 UK mpg, 20.8 km/l) |
| CO2 emissions | 127 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 8.9 sec |
| Acceleration 0 – 62 mph | 8.9 sec |
| Acceleration 0 – 60 mph | 8.5 sec |
| Maximum speed | 209 km/h (129.87 mph) |
| Weight-to-power ratio | 8 kg/Hp, 124.9 Hp/tonne |
| Weight-to-torque ratio | 3.8 kg/Nm, 265 Nm/tonne |
| Power | 165 Hp @ 4000 rpm |
| Power per litre | 84.4 Hp/l |
| Torque | 350 Nm @ 1750-2500 rpm (258.15 lb.-ft. @ 1750-2500 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | A20DTH |
| Engine displacement | 1956 cm3 (119.36 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 4.5 l (4.76 US qt | 3.96 UK qt) |
| Coolant capacity | 6.9 l (7.29 US qt | 6.07 UK qt) |
| Kerb Weight | 1321 kg (2912.31 lbs.) |
| Max. weight | 1881 kg (4146.9 lbs.) |
| Max load | 560 kg (1234.59 lbs.) |
| Trunk (boot) space – minimum | 371 l (13.1 cu. ft.) |
| Fuel tank capacity | 56 l (14.79 US gal | 12.32 UK gal) |
| Length | 4466 mm (175.83 in.) |
| Width | 1840 mm (72.44 in.) |
| Width including mirrors | 2020 mm (79.53 in.) |
| Height | 1489 mm (58.62 in.) |
| Wheelbase | 2695 mm (106.1 in.) |
| Front track | 1585 mm (62.4 in.) |
| Rear track | 1588 mm (62.52 in.) |
| Minimum turning circle | 11.4 m (37.4 ft.) |
| Drivetrain Architecture | Front wheel drive |
| Number of gears | 6 |
| Gearbox type | Manual transmission |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric |
Powertrain & Engine Architecture
The heart of the Astra GTC 2.0 CDTi was the A20DTH engine, a 1.956-liter inline-four cylinder diesel. This engine was part of Vauxhall/Opel’s family of common-rail direct injection diesel engines, known for their efficiency and relatively refined operation. The A20DTH featured a turbocharger with an intercooler, boosting power output to 165 horsepower and a substantial 350 Nm (258 lb-ft) of torque. The common-rail direct injection system, supplied by Bosch, allowed for precise fuel delivery and optimized combustion. The engine utilized a double overhead camshaft (DOHC) valvetrain with four valves per cylinder, contributing to its breathing efficiency. Paired with this engine was a six-speed manual transmission, providing a good balance between performance and fuel economy. The transmission’s gear ratios were tuned to maximize the engine’s torque output, offering strong acceleration in everyday driving situations.
Driving Characteristics
The 2.0 CDTi engine in the Astra GTC provided a noticeably more spirited driving experience compared to the lower-powered 1.7 CDTi variants. Acceleration from 0-60 mph took approximately 8.5 seconds, making it a competitive performer in its class. The readily available torque, peaking from 1750-2500 rpm, meant that strong pulling power was accessible across a wide range of engine speeds. The six-speed manual transmission allowed drivers to keep the engine in its optimal power band. While not a sports car, the GTC 2.0 CDTi offered a comfortable and engaging driving experience, particularly on winding roads. The steering was precise, and the chassis felt well-balanced. Compared to the petrol-powered versions, the diesel offered superior fuel economy, making it a practical choice for long-distance driving.
Equipment & Trim Levels
The Astra GTC 2.0 CDTi typically came with a generous level of standard equipment. This included air conditioning, electric front windows, a CD/MP3 stereo system, alloy wheels, and ABS brakes. Higher trim levels, such as Sport or SRi, added features like sports seats, upgraded interior trim, automatic headlights and rain-sensing wipers, and a more sophisticated infotainment system. Optional extras included a panoramic sunroof, leather upholstery, and a navigation system. The interior design of the GTC was driver-focused, with a well-laid-out dashboard and comfortable seating. The three-door body style meant that access to the rear seats was slightly more challenging than in the five-door hatchback.
Chassis & Braking
The Astra GTC featured a MacPherson strut front suspension and a torsion beam rear suspension. This setup provided a good compromise between ride comfort and handling. The GTC 2.0 CDTi typically came equipped with ventilated front disc brakes and solid rear disc brakes, providing adequate stopping power for its weight and performance. Anti-lock Braking System (ABS) was standard, enhancing safety. The suspension was tuned to provide a slightly firmer ride than the standard Astra hatchback, reflecting the GTC’s sporty aspirations. Stabilizer bars were fitted to both the front and rear axles to reduce body roll during cornering.
Market Reception & Comparison
The Astra GTC 2.0 CDTi was generally well-received by automotive critics. It was praised for its fuel efficiency, strong performance, and comfortable ride. However, some reviewers noted that the interior quality wasn’t quite as refined as some of its rivals, such as the Volkswagen Scirocco. Compared to the 1.7 CDTi variants, the 2.0 CDTi offered a significant performance upgrade, but at a slightly higher price point. Against the petrol-powered Astra GTC models, the 2.0 CDTi provided better fuel economy and comparable performance. The GTC’s three-door body style appealed to buyers looking for a more stylish and sporty alternative to the standard Astra hatchback.
Legacy
The A20DTH engine, while generally reliable, is known to have some potential issues, including turbocharger failure and problems with the diesel particulate filter (DPF), particularly on vehicles that primarily undertake short journeys. Regular servicing and the use of high-quality oil are crucial for maintaining the engine’s longevity. Today, the Astra GTC 2.0 CDTi represents a relatively affordable and practical used car option. Its combination of performance, fuel economy, and stylish design continues to appeal to buyers looking for a sporty and efficient coupe. Well-maintained examples are still relatively common on the used car market, offering a good value proposition for those seeking a capable and enjoyable driving experience.
