The Audi CRLC is a 2,967 cc, V6 twin — turbocharged diesel engine produced between 2018 and 2023. Part of the Volkswagen Group's EA897 evo engine family, it features common rail direct injection, dual overhead camshafts (DOHC), and variable geometry turbocharging on both turbos. Delivering 176 kW (240 PS) and 500 Nm of torque, it provides strong low — end response and refined performance for Audi's premium SUV and sedan lineup.
Fitted to models including the Audi A6 (C8), A7…
All production years (2018–2023) meet Euro 6d standards (VCA UK Type Approval #VCA/EMS/9345).
The Audi CRLC is a 2,967 cc V6 twin-turbo diesel engineered for longitudinal premium platforms (2018–2023). It combines common-rail direct injection with sequential twin variable-geometry turbochargers to deliver strong torque and refined performance. Designed to meet Euro 6d standards, it balances high-speed stability with urban drivability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,967 cc | |
Fuel type | Diesel | |
Configuration | V6, DOHC, 24-valve | |
Aspiration | Twin-turbocharged | |
Bore × stroke | 83.0 mm × 95.5 mm | |
Power output | 176 kW (240 PS) @ 3,500–4,000 rpm | |
Torque | 500 Nm @ 1,750–3,000 rpm | |
Fuel system | Bosch CRS 2-20 common-rail (up to 1,800 bar) | |
Emissions standard | Euro 6d | |
Compression ratio | 16.0:1 | |
Cooling system | Water-cooled with map-controlled thermostat | |
Turbocharger | Sequential twin variable-geometry turbo (Garrett GT1749V + GT1549V) | |
Timing system | Timing chain (lifetime service interval) | |
Oil type | VW 504 00 / 507 00 (SAE 5W-30) | |
Dry weight | 198 kg |
The Audi CRLC was used across Audi's C8/4M platforms with longitudinal mounting and shared within the Volkswagen Group for premium applications. This engine received platform-specific calibrations-shorter intake runners in the A6 and revised cooling routing in the Q8-and from 2019 updated HPFP design for improved longevity, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The CRLC's primary reliability risk is EGR and DPF clogging in vehicles used for short-trip driving. Internal Audi quality reports from 2021 noted increased EGR valve failures in urban-driven units before 120,000 km, while UK DVSA MOT data shows DPF-related failures as a leading cause of emissions failures. Cold climates and poor fuel quality amplify system stress, making regular highway runs and fuel additive use critical.
Analysis derived from Audi technical bulletins (2018–2023) and UK DVSA failure statistics (2023–2024). Repair procedures should follow manufacturer guidelines.
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The CRLC offers strong performance and smooth refinement, with robust internal components. The timing chain is designed for the life of the engine when maintained properly. Regular use of quality diesel (EN 590), adherence to oil change intervals with VW 504 00/507 00 oil, and periodic highway runs to regenerate the DPF and maintain SCR system health are essential for long-term reliability, especially in urban-driven vehicles.
Key issues include EGR/DPF clogging, AdBlue system faults, timing chain tensioner wear, and oil leaks from the valve cover gasket. These are documented in Audi service bulletins, particularly SIB 2019-07 for HPFP improvements. Urban driving and cold climates increase emissions system risks.
The CRLC engine was used in the Audi A6 (C8, 2018–2023), A7 (C8, 2018–2023), A8 (D5, 2018–2023), and Q8 (4M, 2018–2023). It was phased out in favour of updated EA897 evo2 variants with improved emissions and efficiency post-2023.
Yes, the CRLC responds exceptionally well to ECU remapping. Stage 1 tunes typically achieve 280–300 PS safely. The robust internals of the EA897 handle increased boost and torque well. However, supporting modifications like improved cooling and high-quality fuel are strongly advised to maintain reliability under higher loads.
In mixed driving, the CRLC achieves approximately 6.5–7.2 L/100km (39–44 mpg UK). Highway efficiency is around 5.8 L/100km (49 mpg UK), while city driving may reach 8.5 L/100km (34 mpg UK). Real-world figures depend on driving style, vehicle weight, and condition of emissions systems.
Yes, the CRLC is an interference engine. If the timing chain fails, pistons will contact open valves, resulting in severe internal damage. Although the chain is designed for the life of the engine, maintaining correct oil type and service intervals is critical to avoid costly repairs.
Audi specifies VW 504 00 / 507 00 (SAE 5W-30) synthetic oil. This low-ash formulation is essential for DPF and SCR system protection and HPFP longevity. Oil changes should be performed every 15,000 km or annually to maintain engine health and prevent sludge buildup.
Comprehensive technical documentation and regulatory references
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AUDI Official Site
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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.
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