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2006 Audi A6/Quattro/Avant

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2006 A6/Quattro/Avant.

Body PASSENGER CAR

The 2006 Audi A6, offered in sedan, Quattro, and Avant wagon variants, represents a mid-cycle refinement of the C6 platform, blending executive-class comfort with Audi’s signature all-wheel-drive capability in the Quattro models. Under the hood, its robust engine lineup—paired with a 9.3-quart oil capacity requiring 5W-30 or 5W-40 API-rated lubricants—delivered a balance of power and refinement, though this model year stands as a cautionary note in the A6’s reliability narrative. With 67 owner complaints, a disproportionate focus on airbag systems, and four official recalls, the 2006 iteration reflects the growing pains of a generation grappling with early electronic and safety-component teething issues. For researchers, it serves as a pivotal year—one where Audi’s engineering ambition occasionally outpaced real-world durability, making thorough pre-purchase inspections and service records essential for prospective owners.

Quick specs

Fluid capacities, tune-up values and fuel economy at a glance.

Engine oil capacity9.3 qtOEM · verified
Engine oil type5W-30 / 5W-40 APIOEM · verified
Lug nut torque89 ft-lbsOEM · verified

Fitment & sizes

Replacement part sizes and factory part numbers — battery, bulbs, filters and belts.

From the factory this vehicle uses a BCI 48 · 570 CCA battery, OE oil filter 06D115475. Each part links to every other vehicle that shares it, so a part you already stock may fit more of your fleet than you'd expect.

Battery groupBCI 48 · 570 CCAOEM · verified
Tail / brake / turnTAILOEM · verified
Tire sizeP245-45R17OEM · verified

OE service part numbers OEM · verified

Engine oil filter06D115475 alt 06E115562C
Engine air filter4F0133843
Fuel filter4F0201511E alt 4F0201511D
Spark plug101905616 alt 101905621
Battery000915089J alt 000915089BE
Front wiper blades4F1955425F
Serpentine belt079903137E alt 06E903137J
Thermostat079121119 alt 06E121119B
Cabin air filter4F0820261 alt 4F0819439A

Service quick specs OEM factory data

Capacities, torques and tune-up values from the factory service manual.

This engine holds 9.3 qt of 5W-30 / 5W-40 API engine oil, SYNTHETIC · 75W-90 · GL-4 in the differential, DOT 4 brake fluid. Torque lug nuts to 89 ft-lbs, the oil drain plug to 18.4 ft-lbs. The firing order is 1-5-4-8-6-3-7-2.

Lubricants & capacities

Automatic Transmission FluidAudi part number G060162A2
Automatic Transmission Fluid Capacity8.5-11.0
Brake FluidDOT 4
Differential Gear OilSYNTHETIC · 75W-90 · GL-4
Differential Gear Oil Capacity4 Pints
Differential Gear Oil Capacity1.9 Pints
Engine Oil5W-30 · 5W-40 · API
Engine Oil Capacity9.3 qt

Engine torques

Crankshaft Pulley and/or Damper Bolts74 ft-lbs
Intake Manifold to Engine Bolts4 ft-lbs
Exhaust Manifold to Cylinder Head Bolts18 ft-lbs
Intake Manifold to Engine Bolts7.3 ft-lbs
Exhaust Manifold to Cylinder Head Bolts22 ft-lbs
Engine Oil Pan Drain Plug18.4 ft-lbs
Oil Pump to Cylinder BLock Bolts/Studs15 ft-lbs
Engine Valve Cover Bolts7.2

Chassis torques

Lug Nuts89 ft-lbs
Transfer Case Fill Plug26.0 ft-lbs
Transfer Case Drain Plug26.0 ft-lbs

Ignition

Cylinder Firing Order1-4-3-6-2-5
Cylinder Firing Order1-5-4-8-6-3-7-2
Spark Plug ManufacturerVW
Spark Plug Gap0.035 in
Spark Plug Torque22.0 ft-lbs
Spark Plug ManufacturerVW
Spark Plug Gap0.028-0.035 in
Spark Plug Torque22.0 ft-lbs

Battery & A/C

RefrigerantR134a
Optional BCI Group Number95R
Optional BCI Cranking Performance850 cca
Standard BCI Group Number48
Standard BCI Cranking Performance570 cca
Standard BCI Group Number48
Standard BCI Cranking Performance570 cca
Optional BCI Group Number94R

Service checks

Pressure Test14.5 psi
Radiator Cap Pressure Relief20-23 psi
Thermostat Opening Temperature188 °F
Pressure Test14.5 psi
Radiator Cap Pressure Relief20-23 psi
Thermostat Opening Temperature188 °F
Regulated Fuel System Pressure (Without Vacuum)58.0 psi
Regulated Fuel System Pressure (With Vacuum)51.0 psi

Brakes

Torque Caliper to Bracket25 ft-lbs / 22 ft-lbs
Torque to Knuckle103 ft-lbs / 144 ft-lbs / 140 ft-lbs
Torque Caliper to Bracket25 ft-lbs / 22 ft-lbs
Torque to Knuckle103 ft-lbs / 144 ft-lbs / 140 ft-lbs
Rotor Nominal Thickness From0.472 in
Rotor Nominal Thickness To0.472 in
Rotor Discard at or Under0.394 in
Rotor Nominal Thickness From0.472 in

Multi-step torque procedures OEM · verified

Connecting Rod (Large End) Bearings — tightening sequence 1 stages
122 ft. lbs., Step 2: 9022 ft. lbs
Crankshaft Pulley and/or Damper Bolts — tightening sequence 1 stages
116 ft. lbs., step 2: 4516 ft. lbs
Engine Flywheel Bolts — tightening sequence 1 stages
144 ft. lbs., Step 2: 9044 ft. lbs
Engine Flywheel Bolts — tightening sequence 1 stages
144 ft. lbs., Step 2: 4544 ft. lbs

Factory maintenance schedule OEM · verified

Normal service, condensed from the factory interval matrix.

Under the factory schedule, replace the engine oil and filter every 5,000 mi; spark plugs at 35,000 mi.

At 5,000 miBrake System (inspect) · Headlamp Washer Nozzle (inspect) · Headlamp Washer System (inspect fluid level) · Tire & Wheel Assembly (inspect) · Windshield Washer System (inspect) · Windshield Wiper Linkage (lubricate)
Every 5,000 miEngine Oil (drain & refill) · Engine Oil Filter (replace) · Tire & Wheel Assembly (rotate) · Windshield Washer System (inspect fluid level)
Every 10,000 miBrake System (inspect) · Headlamp Washer Nozzle (inspect) · Headlamp Washer System (inspect fluid level) · Tire & Wheel Assembly (inspect) · Windshield Washer System (inspect) · Windshield Wiper Linkage (lubricate)
At 15,000 miAir Intake Hose Debris Screen (clean) · Battery (inspect electrolyte level) · CV Joint Boot (inspect) · Cabin Air Filter (replace) · Door Stop (lubricate) · Driveshaft (inspect)
Every 20,000 miAir Intake Hose Debris Screen (clean) · Battery (inspect electrolyte level) · CV Joint Boot (inspect) · Cabin Air Filter (replace) · Door Stop (lubricate) · Driveshaft (inspect)
At 35,000 miExterior Lighting (inspect) · Power Steering System (inspect fluid level) · Spark Plugs (replace) · Transmission Assembly (drain & refill)
Every 35,000 miHeadlamp (inspect alignment)
Every 40,000 miAir Conditioning Evaporator Case Drain (inspect) · Engine Air Filter Element (replace) · Engine Air Filter Housing (clean) · Exterior Lighting (inspect) · Power Steering System (inspect fluid level) · Spark Plugs (replace)
At 55,000 miEngine Air Filter Element (replace) · Engine Air Filter Housing (clean)

Reliability & federal safety record

Owner-reported issues, recalls, investigations and service bulletins on record with NHTSA — an unfiltered look at what owners actually experience.

Owner complaints about the 2006 Audi A6/Quattro/Avant dominate in one area — the air bags, 37 of 67 reports (55%), well ahead of the next concern. That matters, because the air bags are also the target of recalls 18V-427 and 17V-032 on this vehicle — so the single most useful check before buying or servicing one is confirming they were actually performed. 3 of the reports describe a crash and 1 a fire — a small share of the total, but worth weighing against the air bags pattern above. These are tallies of what owners actually reported to the federal government, not an editorial score — and higher-selling models naturally rack up more reports.

4
Open recalls
NHTSA campaigns
417
Service bulletins
Manufacturer communications
0
ODI investigations
Office of Defects Investigation
67
Owner complaints
3 involved a crash · 1 a fire
NHTSA crash-test rating federal NCAP · out of 5 stars
Rollover★★★★★

Owner complaints filed with NHTSA, by component

All 67 complaints on record, top 8 components.

Air Bags37
Electrical System5
Tires3
Service Brakes2
Steering,Power Train,Electrical System2
Air Bags,Seat Belts2
Engine1
Engine,Fuel/Propulsion System1

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 2 of 4 campaigns on record for this vehicle.

18V427000Air Bags:Frontal:Passenger Side:Inflator ModuleReported 22/06/2018

Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2005-2008 Audi A4 Sedan, A4 Avant, S4 Avant and S4 Sedan, 2007-2008 RS4 Sedan, 2004 RS4 Cabriolet, 2007-2009 A4 Cabriolet and S4 Cabriolet, 2005-2011… Remedy: Audi has notified owners, and dealers will replace the passenger frontal air bag with an alternate remedy part, free of charge. The recall began June 29, 2018. Owners may contact…

17V032000Air Bags:Frontal:Passenger Side:Inflator ModuleReported 11/01/2017

Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2009 Audi A4 Cabriolet, S4 Cabriolet, A6 Avant, A6 Sedan and S6 Sedan vehicles originally sold, or ever registered, in Arizona, Arkansas, Delaware, the… Remedy: Audi will notify owners, and dealers will replace the passenger frontal air bag inflator, free of charge. The recall began March 30, 2018. Owners may contact Audi customer service…

Technical service bulletins NHTSA · verified

Showing 5 of 417 bulletins on record with NHTSA.

BulletinDateComponentSummary
A0023742052680_42023-10-04EquipmentThis bulletin provides information on the additional reporting requirements for safety…
DC_AudiRingsV122023-04-28EquipmentInside the Rings | Volume 12, Spring 2023
TRMDMV_NM_Audi2023-03-13Air BagsIn conjunction with the New Mexico DMV, Audi will be sending Takata airbag recall…
TRMDMV_MA_Audi2023-03-13Air BagsIn conjunction with the Massachusetts DMV, Audi will be sending Takata airbag recall…
TRMDMV_CO_Audi2023-02-13Air BagsIn conjunction with the Colorado DMV, Audi will be sending Takata airbag recall reminder…

Common OBD-II trouble codes

The most common OBD-II codes for this vehicle's emissions system. These are standardized SAE J2012 definitions, not vehicle-specific fault reports.

P0420
Catalyst system efficiency below threshold — Bank 1
P0300
Random / multiple cylinder misfire detected
P0171
System too lean — Bank 1
P0455
Evaporative emission system leak detected — large leak
P0128
Coolant thermostat below regulating temperature
P0442
Evaporative emission system leak detected — small leak

VIN tools

Decode factory build data for a specific vehicle by VIN.

VIN
Decode a VIN to confirm the transmission and build data for a specific A6/Quattro/Avant. OEM
Build data
Plant, GVWR class, engine and body data for any 17-character VIN.
Recalls
Check open recall campaigns against a specific vehicle by VIN.

Vehicles with shared specs

Find every vehicle that shares this one's battery, bulbs, oil capacity, platform or parts.

Group 48 batteryVehicles taking 9.3 qtEngine oil filter 06D115475Engine air filter 4F0133843Fuel filter 4F0201511ESpark plug 101905616

Reference guides

Cross-vehicle references for the kinds of data on this page.

Vehicle recalls & TSBsOBD-II trouble codesTorque specificationsMaintenance schedulesFluid capacities & specs

Frequently asked

How much oil does the 2006 A6/Quattro/Avant take?

9.3 qt of 5W-30 OR 5W-40 API MEETING VW SPECIFICATION VW50200, per the factory manual.

Does the 2006 A6/Quattro/Avant have open recalls?

NHTSA lists 4 recall campaign(s) for this model year. Check your specific vehicle by VIN.