A6 C6
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Which Audi A6 C6 engine is the most reliable? See common problems, reviews and reliability verdicts across generations and engines.
Frequently asked questions
Which Audi A6 C6 engine is the most reliable?
3.0 TDI V6 quattro (ASB/CDYA) — Reliable verdict. The 3.0 TDI quattro — widely regarded as the reference modern diesel of its day: strong, smooth and durable with regular (15,000 km) oil changes. The post-2008 versions are especially solid. Watch intake carbon/EGR and DPF, plus high running costs, but the core engine is excellent.
Which Audi A6 C6 engines should you avoid?
None of the Audi A6 C6 engines listed are rated "Problematic" or "Avoid" — but always check the service history before buying.
What are the most common Audi A6 C6 problems?
The most commonly reported problems across all Audi A6 C6 generations and engines: Oil consumption (piston rings), Timing chain tensioner failure, Cylinder wall scoring (leaking injectors), Oil pump hex / injectors (PD, pre-2008), Multitronic CVT weakness.