Used Audi Allroad

What to know before buying: Audi Allroad

From 5 forum threads and 2 press tests · updated 11/10/2026

What the reviews say

• The C6 combines permanent Quattro all-wheel drive, adjustable air suspension and a six-speed automatic; its owner praises long-distance comfort.[3][4]Audi A6 allroad C6
• The C6's roomy boot, folding rear seats and roof rails let its owner carry family belongings and bulky building materials.[3][4]Audi A6 allroad C6
• A C6 3.0 TDI owner covered 140,000 km in ten years and recorded average diesel consumption of about 12 L/100 km.[3][4]Audi A6 allroad C6
• The C5 came with a 2.7 biturbo V6, 4.2 V8 or 2.5 V6 TDI; some manual versions had a low-range gear.[5]one sourceAudi A6 allroad C5

Typical faults

• A C6 owner's log records repeated repairs to front air struts and bellows, both rear bellows, the compressor and valve block.[3][4]Audi A6 allroad C6

  33 500–138 000 km · 3.0 TDI

• The intake manifold on a C6 3.0 TDI was replaced because its flap linkage failed at 31,500 km.[3][4]Audi A6 allroad C6

  31 500–31 500 km · 3.0 TDI

• A C6 owner's front wheel bearings began humming at 70,000 km, while all front arms and bushes were progressively replaced between 70,000 and 90,000 km.[3][4]Audi A6 allroad C6

  70 000–90 000 km · 3.0 TDI

• At 140,000 km, a C6 3.0 TDI smoked at idle and was awaiting an EGR valve repair.[3][4]Audi A6 allroad C6

  140 000–140 000 km · 3.0 TDI

• A C5 at 200,000 km had a gearbox oil-seal leak and sixth-gear noise that the owner attributed to possible gear or synchronizer wear.[2]one sourceAudi A6 allroad C5

  200 000–200 000 km · 2.5 TDI

• Audi's 2.5 V6 TDI is reported to suffer camshaft wear around 300,000 km and prolonged starting; this engine was offered in the C5 Allroad.[1][5]Audi A6 allroad C5

  300 000–300 000 km · 2.5 V6 TDI

Which engine and version to take

• For the C6, the source recommends the 3.0 TDI Quattro as the best blend of performance and economy.[6]one sourceAudi A6 allroad C6

What to avoid

• Approach the C5 2.5 V6 TDI cautiously: owner reports mention camshaft wear plus fuel-pump and glow-plug trouble.[1][5]Audi A6 allroad C5

What to check at the inspection

• Test every suspension height, watch for dashboard warnings and, after the car has stood, check that no corner has dropped and no air leak is audible.[2][3][4]Audi A6 allroad C5Audi A6 allroad C6
• On a C5 test drive, check every gear—especially sixth—and inspect the gearbox for oil leaking past its seals.[2]one sourceAudi A6 allroad C5
• Demand a complete service book, verify its entries and, for a diesel, compare the odometer with the Audi dealer's VIN-based service history.[6][5]Audi A6 allroad C6
• Before purchase, run a full computer scan and check dashboard warnings, focusing on engine management, ABS, the parking brake and transmission.[7]one source
• Inspect the front arms, bushes and wheel bearings: in one C6 owner's experience they required replacement between 70,000 and 90,000 km.[3][4]Audi A6 allroad C6
• On a C5 2.5 V6 TDI, check cold starting, fuel-pump and glow-plug operation, and ask whether camshaft wear has been inspected.[1][5]Audi A6 allroad C5

Verdict

Sources

1. [1]iauto.lv — Jūsu piredze ar Audi a6 2.5 tdi - Forums · forum
2. [2]audisport-iberica.com — Allroad, problemas varios - Audi A6 / Allroad C5 (1997-2004) · forum
3. [3]audi-club.ru — Audi A6 Allroad С6 3.0TDI - честный обзор после 10 лет. · forum
4. [4]audi-club.ru — A6 Allroad C6 3.0TDI - честный обзор после 10 лет. · forum
5. [5]offroad-bulgaria.com — Audi Allroad коментари · forum
6. [6]whatcar.lv — Lietota Audi A6 pirkšanas padomi - What Car? - WhatCar.lv · press
7. [7]ir.lv — Biežākās problēmas ar lietotām Audi automašīnām un ... · press

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