The Audi CUWA is a 2,967 cc, V6 twin — turbocharged diesel engine produced between 2019 and 2024. It belongs to the EA851 engine family, designed for high torque output and refined performance in premium SUVs and executive sedans. Featuring common rail direct injection, variable geometry turbocharging (VGT), and DOHC valvetrain, it delivers 170 kW (231 PS) and 500 Nm of torque, with overboost capability increasing torque to 550 Nm for short durations.
Fitted to models suc…
All production years (2019–2024) comply with Euro 6d-TEMP or Euro 6d standards depending on market .
The Audi CUWA is a 2,967 cc V6 twin-turbocharged diesel engine developed for longitudinal applications (2019–2024). It integrates common rail injection with sequential turbocharging to deliver strong low-end torque and linear power delivery. Designed to meet stringent Euro 6d emissions standards, it uses SCR/AdBlue technology, iEGR, and a DPF for full compliance while maintaining drivability and refinement in luxury applications.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,967 cc | |
Fuel type | Diesel | |
Configuration | V6, DOHC, 24-valve | |
Aspiration | Twin-turbocharged (sequential VGT) | |
Bore × stroke | 83.0 mm × 95.5 mm | |
Power output | 170 kW (231 PS) @ 3,250–4,200 rpm | |
Torque | 500 Nm @ 1,750–3,000 rpm (550 Nm overboost) | |
Fuel system | Common rail (up to 2,200 bar), Bosch CP4.3 | |
Emissions standard | Euro 6d-TEMP (2019–2020); Euro 6d (2021–2024) | |
Compression ratio | 16.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Sequential variable geometry turbo (BorgWarner VTG) | |
Timing system | Dual chain (primary and secondary) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 185 kg |
The Audi CUWA was used across Audi's MLB Evo platform with longitudinal mounting and shared with Volkswagen Group brands. This engine received platform-specific adaptations-integrated exhaust manifolds and revised turbo routing in the A8-and from 2021 the updated EA851 variant introduced improved fuel filtration and HPFP revisions, creating interchange limits. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
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The CUWA offers strong torque and refinement, but early models (2019–2020) had high-pressure fuel pump concerns. Later revisions (post-2021) improved fuel filtration and pump internals, enhancing durability. Regular maintenance using VW 504 00 oil and 15,000 km service intervals greatly improves long-term reliability, especially in regions with consistent diesel quality.
Key issues include HPFP wear (especially pre-2021), EGR/DPF clogging due to short trips, turbo actuator failures, and AdBlue system faults. These are documented in Audi service bulletins and field reports, with fuel pump failure being the most critical if maintenance or fuel quality is compromised.
The CUWA engine was used in the Audi A6 (C8), A7 (C8), A8 (D5), and Q7 (4M) from 2019 to 2024. All variants produce 231 PS and meet Euro 6d emissions standards. It is not shared with other Volkswagen Group brands and is exclusive to Audi's premium longitudinal-platform vehicles.
Aftermarket ECU tuning is common on the CUWA platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
In combined driving, the CUWA achieves ~6.8 L/100km (42 mpg UK). Highway efficiency improves to ~6.2 L/100km (46 mpg UK), while city driving may reach 8.0 L/100km (35 mpg UK). Real-world consumption depends on driving style, but 35–45 mpg UK is typical for mixed use in large Audi models.
Yes. The CUWA is an interference engine. If the timing chain fails, pistons can collide with open valves, causing catastrophic internal damage. Immediate attention to chain rattle or oil pressure warnings is essential to prevent engine destruction.
Audi specifies SAE 5W-30 oil meeting VW 504 00 (diesel) or 507 00 (multi) standards. Use of correct oil is critical for timing chain lubrication. Change intervals should not exceed 15,000 km or one year to maintain engine longevity and prevent premature wear.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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