Audi A8 40 TDI Review: Diesel Performance, Range, Comfort
Discover why the Audi A8 40 TDI excels in luxury, diesel efficiency, and refined performance for executive drivers.
The Audi A8 40 TDI stands out as a benchmark in the luxury sedan segment, combining a potent diesel engine with unparalleled refinement and advanced engineering. This model delivers smooth power delivery, impressive fuel efficiency, and a cabin designed for ultimate comfort, making it a top choice for business executives and long-haul travelers.
Powerful and Efficient Diesel Heart
At the core of the Audi A8 40 TDI is a 3.0-liter turbodiesel V6 engine, producing substantial torque for effortless acceleration. In testing, this setup achieves 0-60 mph in around 6.3 seconds, with torque figures reaching 406 lb-ft, ensuring brisk performance without compromising on economy. The engine pairs with an eight-speed automatic transmission and Audi’s quattro all-wheel drive, providing confident handling in varied conditions.
Fuel efficiency is a highlight, with EPA estimates of 24 mpg city and 36 mpg highway for similar TDI variants, translating to real-world ranges exceeding 500 miles per tank. This makes it ideal for motorway dominance, where the diesel’s low-end pull shines. Compared to petrol counterparts, the TDI offers better economy while matching or exceeding their refinement.
| Engine Spec | Details |
|---|---|
| Displacement | 3.0L V6 Turbodiesel |
| Power | 240 hp |
| Torque | 406 lb-ft |
| 0-60 mph | 6.3 seconds |
| Fuel Economy (Combined) | 28-32 mpg |
Exceptional Ride and Handling Dynamics
The A8 40 TDI’s air suspension system adapts seamlessly to road conditions, delivering a plush ride that isolates occupants from imperfections. In dynamic mode, the chassis firms up, steering sharpens, and the vehicle lowers slightly for enhanced stability, transforming it from a cruiser to a capable handler.
Quattro all-wheel drive ensures traction in wet or snowy weather, with minimal body roll thanks to the lightweight aluminum space frame. Reviewers note its agility belies its size, feeling nimble rather than cumbersome. The stop-start system, while occasionally noticeable, restarts swiftly and can be disabled for uninterrupted flow.
- Adaptive air suspension for customizable comfort
- Multiple drive modes: Comfort, Auto, Dynamic, Individual
- Quattro AWD for superior grip
- Precise eight-speed Tiptronic transmission
Luxurious Interior and Cutting-Edge Technology
Step inside the A8 40 TDI, and you’re greeted by a cabin of impeccable craftsmanship, with premium materials like soft leather, wood veneers, and ambient lighting. The space is generous, especially in the long-wheelbase version, offering limo-like rear legroom for passengers.
Technology abounds with the MMI infotainment system, featuring a dual-touchscreen setup, Google Earth navigation, and Wi-Fi hotspot capability. Voice commands and customizable interfaces make it intuitive, while features like night vision assist and adaptive cruise control enhance safety and convenience.
Noise insulation is exemplary, with diesel clatter virtually absent, creating a library-quiet environment even at highway speeds.
Design and Practicality Considerations
The A8’s exterior exudes understated elegance with its sleek lines and LED matrix headlights. While some critique its anonymous styling, it prioritizes presence over flashiness. Dimensions include a length around 5,051 mm, providing ample presence without excess bulk.
Boot space measures 500 liters, sufficient for luggage but smaller than some rivals. The 90-liter fuel tank supports extended journeys, a boon for diesel fans seeking convenience.
Performance Across Engine Lineup
While the 40 TDI shines, the A8 lineup offers variety. The supercharged 3.0T V6 delivers 333 hp for 5.3-second sprints, the 4.0T V8 packs 420 hp with 4.2-second acceleration, and larger engines cater to power enthusiasts. Yet the TDI’s torque-rich efficiency often steals the show for practical luxury.
| Model | Power | 0-60 mph | Economy (Combined MPG) |
|---|---|---|---|
| 3.0 TDI (40 TDI) | 240 hp | 6.3s | 28-32 |
| 3.0T Supercharged | 333 hp | 5.3s | 21 |
| 4.0T V8 | 420 hp | 4.2s | 19-21 |
Safety and Reliability Features
Audi equips the A8 with comprehensive safety tech, including pre-sense collision avoidance, lane-keeping assist, and traffic jam assist for semi-autonomous driving. The robust aluminum chassis enhances crash protection. Long-term reliability is strong, with diesel models praised for durability in high-mileage scenarios.
Ownership Experience and Value
Pricing positions the A8 40 TDI as a premium choice, but used models offer value with low running costs due to diesel economy. Maintenance follows Audi’s schedule, with quattro and air suspension requiring attention but delivering lasting performance.
Competitors like the BMW 7 Series and Mercedes S-Class vie for supremacy, but the A8’s tech integration and ride comfort give it an edge.
Frequently Asked Questions (FAQs)
Is the Audi A8 40 TDI fuel-efficient?
Yes, it achieves up to 36 mpg highway, far surpassing petrol variants.
How does the ride quality compare to rivals?
Its air suspension provides superior isolation, especially on motorways.
Is the diesel engine noisy?
No, insulation keeps clatter minimal inside the cabin.
What are the key tech features?
Dual MMI screens, Google integration, adaptive cruise, and more.
Suitable for long trips?
Absolutely, with 500+ mile range and supreme comfort.
Conclusion: A Masterclass in Luxury Diesel
The Audi A8 40 TDI redefines executive transport with its efficient powertrain, sumptuous interior, and dynamic poise. It’s not just a car; it’s a statement in refined mobility.
References
- 2014 Audi A8 Review & Ratings — Edmunds. 2014. https://www.edmunds.com/audi/a8/2014/review/
- 2014 Audi A8 and A8L (and TDI) Test Drive Review — YouTube (TestDriveNow). 2014. https://www.youtube.com/watch?v=bskGDfRwxp4
- Audi A8 4.0 TDI Quattro 4dr Tip Auto Reviews — Top Gear. 2026. https://www.topgear.com/car-reviews/audi/a8/40-tdi-quattro-4dr-tip-auto/spec
- Better Than a 7 Series? | Audi A8 TDI Review — YouTube (EP17). 2018. https://www.youtube.com/watch?v=Nz4tEkyjVE8
- Tested: 2014 Audi A8L TDI Diesel — Car and Driver. 2014. https://www.caranddriver.com/reviews/a15113800/2014-audi-a8l-tdi-diesel-test-review/
- Audi A8 Review 2026 — Carwow. 2026. https://www.carwow.co.uk/audi/a8
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