The Audi Q8 (4M) 45 TDI V6 quattro Mild Hybrid Tiptronic represents a compelling blend of luxury, performance, and efficiency within the Q8 lineup. Introduced in February 2019 and continuing through October 2020, this variant occupied a significant position as a mid-range offering, bridging the gap between the entry-level 40 TDI and the higher-performance 50 TDI models. Built on the MLB Evo platform, shared with other Volkswagen Group SUVs, the Q8 aimed to deliver a more sporting driving experience than the traditional Q7, while maintaining the practicality expected of a large SUV. This specific configuration, combining a 3.0-liter turbocharged diesel engine with a mild-hybrid system and an eight-speed Tiptronic automatic transmission, was primarily targeted at European markets where diesel engines remained popular due to their fuel efficiency and torque characteristics.
Technical Specifications
| Brand | Audi |
| Model | Q8 |
| Generation | Q8 (4M) |
| Type (Engine) | 45 TDI V6 (231 Hp) quattro Mild Hybrid Tiptronic |
| Start of production | February, 2019 |
| End of production | October, 2020 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | SUV |
| Seats | 5 |
| Doors | 5 |
| Combined fuel consumption (WLTP) | 8.1-8.8 l/100 km (29 – 26.7 US mpg) |
| CO2 emissions (WLTP) | 212-231 g/km |
| Fuel consumption (urban) | 7.0-7.2 l/100 km (33.6 – 32.7 US mpg) |
| Fuel consumption (extra urban) | 6.1-6.4 l/100 km (38.6 – 36.8 US mpg) |
| Fuel consumption (combined) | 6.4-6.7 l/100 km (36.8 – 35.1 US mpg) |
| CO2 emissions | 169-176 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 7.1 sec |
| Acceleration 0 – 62 mph | 7.1 sec |
| Acceleration 0 – 60 mph | 6.7 sec |
| Maximum speed | 233 km/h (144.78 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 9.3 kg/Hp |
| Weight-to-torque ratio | 4.3 kg/Nm |
| Power | 231 Hp @ 3250-4750 rpm |
| Torque | 500 Nm @ 1750-3250 rpm (368.78 lb.-ft.) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | DHXC |
| Engine displacement | 2967 cm3 (181.06 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Cylinder Bore | 83 mm (3.27 in.) |
| Piston Stroke | 91.4 mm (3.6 in.) |
| Compression ratio | 16:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Engine oil capacity | 6.1 l (6.45 US qt | 5.37 UK qt) |
| Coolant | 12.3 l (13 US qt | 10.82 UK qt) |
| Kerb Weight | 2145 kg (4728.92 lbs.) |
| Max. weight | 2890 kg (6371.36 lbs.) |
| Max load | 745 kg (1642.44 lbs.) |
| Trunk (boot) space – minimum | 605 l (21.37 cu. ft.) |
| Trunk (boot) space – maximum | 1755 l (61.98 cu. ft.) |
| Fuel tank capacity | 75 l (19.81 US gal | 16.5 UK gal) |
| AdBlue tank | 24 l (6.34 US gal | 5.28 UK gal) |
| Max. roof load | 100 kg (220.46 lbs.) |
| Permitted trailer load with brakes (8%) | 2800 kg (6172.94 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Length | 4986 mm (196.3 in.) |
| Width | 1995 mm (78.54 in.) |
| Height | 1705 mm (67.13 in.) |
| Wheelbase | 2995 mm (117.91 in.) |
| Gearbox | 8 gears, automatic transmission Tiptronic |
Powertrain & Engine Architecture
At the heart of the Q8 45 TDI lies the DHXC engine, a 3.0-liter V6 diesel engine. This engine is part of Volkswagen Group’s modular engine family and features a cast iron block, aluminum cylinder heads, and four valves per cylinder. The engine utilizes a sophisticated common-rail direct injection system, delivering fuel at pressures up to 2,500 bar for optimized combustion. A variable geometry turbocharger (VGT) with an intercooler provides ample boost, contributing to the engine’s 500 Nm (368.78 lb.-ft.) of torque available from 1750 to 3250 rpm. The mild-hybrid system, employing a 48-volt electrical system, incorporates a belt starter generator (BSG) that enables features like extended engine-off coasting, regenerative braking, and smoother start-stop operation. This system contributes to improved fuel economy and reduced emissions. The eight-speed Tiptronic automatic transmission is a torque-converter type, known for its smooth shifts and responsiveness. It allows for both automatic operation and manual gear selection via steering wheel-mounted paddles.
Driving Characteristics
The Q8 45 TDI with the Tiptronic transmission delivers a refined and comfortable driving experience. While not as overtly sporty as the higher-output 50 TDI, the 231 hp and 500 Nm of torque provide ample power for everyday driving and confident overtaking. The Tiptronic transmission is well-matched to the engine’s torque curve, offering smooth and timely gear changes. The quattro all-wheel-drive system provides excellent traction in various conditions, enhancing stability and control. Compared to a manual transmission equipped Q8, the Tiptronic offers greater convenience, particularly in urban environments. However, some enthusiasts might find the automatic transmission slightly less engaging than a manual. The gear ratios are tuned for a balance between fuel efficiency and performance, with a relatively tall final drive contributing to lower engine speeds at highway cruising.
Equipment & Trim Levels
The Q8 45 TDI typically came well-equipped as standard. Interior features included leather upholstery, power-adjustable front seats with memory function, a panoramic sunroof, and a premium sound system. The MMI touch response system, featuring dual touchscreens, controlled infotainment and vehicle settings. Standard safety features included Audi pre sense basic, lane departure warning, and parking assist. Optional extras included adaptive cruise control, a head-up display, and upgraded interior trim packages. The trim level often dictated the exterior styling elements, such as chrome accents and wheel designs.
Chassis & Braking
The Q8 45 TDI utilizes an independent multi-link suspension setup at both the front and rear axles. This configuration provides a comfortable ride quality while maintaining good handling characteristics. The suspension is tuned to balance comfort and control, offering a stable and predictable driving experience. The Q8 45 TDI typically featured ventilated disc brakes at the front and solid disc brakes at the rear. The braking system is assisted by ABS (Anti-lock Braking System) and electronic stability control (ESC). The steering system is an electromechanical power steering system, providing precise and responsive steering feel.
Market Reception & Comparison
The Audi Q8 45 TDI was generally well-received by automotive critics. It was praised for its comfortable ride, spacious interior, and refined powertrain. The fuel economy was considered competitive for a vehicle of its size and class. Compared to the Q8 40 TDI, the 45 TDI offered a noticeable performance upgrade, while remaining more affordable than the 50 TDI. The mild-hybrid system was also seen as a positive feature, contributing to improved efficiency and reduced emissions. However, some critics noted that the Q8’s styling was somewhat conservative compared to its rivals.
Legacy
The Audi Q8 45 TDI V6 quattro Mild Hybrid Tiptronic has proven to be a relatively reliable vehicle in the used car market. The 3.0-liter TDI engine is known for its durability, provided it has been properly maintained. The Tiptronic transmission is also generally reliable, although regular fluid changes are essential. The mild-hybrid system has not presented significant issues in terms of long-term reliability. Today, these Q8s represent a good value proposition for buyers seeking a luxurious and capable SUV with reasonable running costs. The combination of performance, efficiency, and practicality continues to make it an attractive option in the used car market.
