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2021 Audi A6 Quattro

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2021 A6 Quattro.

The 2021 Audi A6 Quattro, a luxury sedan requiring 5.4 quarts of 0W-20 oil, has drawn 15 owner complaints, with the electrical system as the primary trouble spot, alongside 11 recalls, positioning this model year as one with notable reliability concerns that demand attention to potential electrical faults.

Model year202520242023202220212020200520001999

Quick specs

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

Engine oil capacity5.4 qtOEM · verified
Engine oil type0W-20OEM · 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 Refer to the appropriate service information for options and battery usage. battery, OE oil filter 06M115441G. 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 Refer to the appropriate service information for options and battery usage.OEM · verified
Tail / brake / turnLAMPOEM · verified
Tire size245/45R19OEM · verified
Wheel / rim8.5 inOEM · verified

OE service part numbers OEM · verified

Engine oil filter06M115441G alt 06L115562B
Engine air filter4K0133844E alt 4K0133844D
Spark plug06Q905601A alt 06M905606F
Battery000915089BC
Front wiper blades4K1998002D
Thermostat06M121688 alt 06M121115N
Cabin air filter4M0819439C

Full specifications

Engine, drivetrain, dimensions and economy.

Dimensions & weight NHTSA vPIC

Overall length194.5 in
Overall width74.4 in
Overall height57.5 in
Wheelbase115 in
Curb weight4266 lb
Track (front / rear)64.2 / 63.8 in
Weight distribution (front / rear)55/45

Service quick specs OEM factory data

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

This engine holds 5.4 qt of 0W-20 engine oil, Rear: 09R in the differential, DOT 4 brake fluid. Torque lug nuts to 89 ft-lbs, the oil drain plug to Use new seal: 22.0 ft-lbs. The firing order is 1-4-3-6-2-5.

Lubricants & capacities

Brake FluidDOT 4
Clutch FluidDOT 4
Differential Gear OilAudi P/N G 060 190 A2
Differential Gear OilRear: 09R
Engine CoolantAudi Coolant G13-TL-VW774J
Engine Coolant Capacity10.5 qt
Engine Oil0W-20
Engine Oil Capacity5.4 qt

Engine torques

Cylinder Head InstructionsOnly use new bolts.
Cylinder Head InstructionsOnly use new bolts.
Engine Oil Pan Drain PlugUse new seal: 22.0 ft-lbs

Chassis torques

Differential Fill PlugFinal Drive: 12.0 ft-lbs
Differential drain PlugFinal Drive: 12.0 ft-lbs
Lug Nuts89 ft-lbs

Ignition

Cylinder Firing Order1-3-4-2
Cylinder Firing Order1-4-3-6-2-5

Battery & A/C

RefrigerantR1234yf
Refrigerant CapacityPR Code TV8

Service checks

Fuel Pump Pressure Minimum87.0 psi
Fuel Pump Pressure Maximum116.0 psi
Residual Pressure43.45 psi

Brakes

Brake Caliper Bolt to Carrier TorqueFront: NS, Rear: Use new bolts: 26.0 ft-lbs
ABS Sensor Torque6.4
Minimum Pad Thickness0.079" in
Vented Rotor Minimum Thickness for ReplacementFront: 1LC; Rear: 1KD

Multi-step torque procedures OEM · verified

Crankshaft Pulley and/or Damper Bolts — tightening sequence 1 stages
1110.0 ft. lbs., Step 2: 150.0 ft. lbs., Step 3: 90°110 ft. lbs
Cylinder Head — tightening sequence 1 stages
1Bolts with Collar37 ft. lbs
Cylinder Head — tightening sequence 1 stages
1Completely install all bolts by hand. Step 222 ft. lbs
Exhaust Manifold to Cylinder Head Bolts — tightening sequence 1 stages
111.0 ft. lbs., Step 2: 22.011 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 10,000 mi; spark plugs every 30,000 mi.

Every 10,000 miBrake Linings (inspect) · Engine Oil (drain & refill) · Engine Oil Filter (replace) · Tire Repair Kit Sealant (inspect)
Every 20,000 miAir Conditioning Evaporator Case Drain (inspect) · Body Water Drains (inspect) · Brake Line (inspect) · Cabin Air Filter (replace) · Door Hinge (lubricate) · Engine Assembly (leak inspection)
Every 30,000 miSpark Plugs (replace)
Every 40,000 miTransmission Assembly (drain & refill)
Every 60,000 miDrive Axle Assembly (drain & refill) · Drive Belt (replace) · Engine Air Filter Element (replace)

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 2021 Audi A6 Quattro dominate in one area — the electrical system, 6 of 15 reports (40%), well ahead of the next concern. None of this vehicle's 11 recall campaigns target the electrical system, so those reports read as owner-reported wear-and-tear rather than an acknowledged defect. 0 of the reports describe a crash and 0 a fire — a small share of the total, but worth weighing against the electrical system 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.

11
Open recalls
NHTSA campaigns
1295
Service bulletins
Manufacturer communications
0
ODI investigations
Office of Defects Investigation
15
Owner complaints
0 involved a crash · 0 a fire
NHTSA crash-test rating federal NCAP · out of 5 stars
Overall★★★★★
Frontal★★★★★
Side★★★★★
Rollover★★★★★

Owner complaints filed with NHTSA, by component

All 15 complaints on record, top 8 components.

Electrical System6
Unknown Or Other1
Engine & Engine Cooling1
Engine1
Power Train1
Power Train,Electrical System1
Forward Collision Avoidance1
Electrical System,Unknown Or Other,Forward Collision Avoidance1

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 2 of 11 campaigns on record for this vehicle.

21V606000Seat Belts:Rear/Other:RetractorReported 05/08/2021

Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2021 Volkswagen ID4, Audi A4 Allroad, A4 Sedan, A5 Cabriolet, A5 Coupe, A5 Sportback, A6 Allroad, A6 Sedan, A7, A8, E-Tron Quattro, E-Tron Sportback… Remedy: Dealers will inspect, and replace as necessary, the middle-rear seat belt assemblies, free of charge. Owner notification letters were mailed August 27, 2021. Owners may contact…

22V034000TiresReported 26/01/2022

Volkswagen Group of America, Inc. (Audi) is recalling certain 2019-2021 Audi A5 Sportback, RS5 Coupe, RS5 Sportback, S5 Sportback, 2020-2021 A4 Allroad, A4 Sedan, A5 Cabriolet, A5 Coupe, A6 Allroad, A6 Sedan, A7, A8… Remedy: Dealers will inspect the rear axle, adjust the alignment as necessary, and replace any prematurely or unevenly worn tires, free of charge. Owner notification letters were mailed…

Technical service bulletins NHTSA · verified

Showing 5 of 1295 bulletins on record with NHTSA.

BulletinDateComponentSummary
TSB_2079747_22026-06-30StructureThis bulletin provides information regarding various complaints about front or rear door…
TSB_2076404_82026-06-29Unknown Or OtherThis bulletin provides a deployment overview for customer service packages MLB and MQB…
TSB_2074640_32026-06-26EngineThis bulletin provides information when there is increased oil consumption; >0.5ltr/1000…
TSB_2074729_32026-06-23Electrical SystemThis bulletin provides informationwhen noises/vibration are detected from front of…
TSB_2059335_72026-06-23Electrical SystemThis bulletin provides information when there are noises from the area around the…

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. 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 R batteryVehicles taking 5.4 qtEngine oil filter 06M115441GEngine air filter 4K0133844ESpark plug 06Q905601ABattery 000915089BC

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 2021 A6 Quattro take?

5.4 qt of Audi 0W-20, per the factory manual.

Does the 2021 A6 Quattro have open recalls?

NHTSA lists 11 recall campaign(s) for this model year. Check your specific vehicle by VIN.