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2021 Audi A8 Quattro

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2021 A8 Quattro.

The 2021 Audi A8 Quattro is equipped with a 55TFSI engine that utilizes 0W-20 viscosity oil. This model year's reliability profile includes 10 recalls and a total of 5 owner complaints, with the electrical system identified as the top complaint area. These figures provide a concrete baseline for researchers evaluating the vehicle's overall stability and service history.

Model year2025 2024 2023 2022 2021 2020

Quick specs

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

Engine oil capacityEquipped with 55TFSIOEM · 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

Tire size255/45R19/XL 104HOEM · verified

Wheel / rim9 inOEM · verified

OE service part numbers OEM · verified

Engine oil filter	06M115441G alt 06M198405F
Engine air filter	4N0129620C alt 4N0129620B
Spark plug	0P2905601 alt 06M905606F
Battery	000915089BC
Front wiper blades	4N1998002 alt 4N1998002B
Thermostat	0P2121115E alt 06M121688
Cabin air filter	4M0819439C

Full specifications

Engine, drivetrain, dimensions and economy.

Dimensions & weight NHTSA vPIC

Overall length	208.7 in
Overall width	76.8 in
Overall height	57.9 in
Wheelbase	123.2 in
Curb weight	4475 lb
Track (front / rear)	64.6 / 64.2 in

Service quick specs OEM factory data

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

This engine holds Equipped with 55TFSI of 0W-20 engine oil, 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 1-5-4-8-6-3-7-2.

Lubricants & capacities

Automatic Transmission Fluid	Audi P/N G 060 162 A2
Automatic Transmission Fluid Capacity	9.0 qt
Automatic Transmission Fluid	Audi P/N G 060 162 A2
Automatic Transmission Fluid Capacity	9.0 qt
Brake Fluid	DOT 4
Clutch Fluid	DOT 4
Engine Coolant	Audi Coolant G13-TL-VW774J
Engine Coolant Capacity	10.5 qt

Engine torques

Cylinder Head Instructions	Only use new bolts.
Cylinder Head Instructions	Only use new bolts.
Engine Oil Pan Drain Plug	Use new seal: 22.0 ft-lbs
Engine Oil Pan Drain Plug	Use new seal: 22.0 ft-lbs
Engine Oil Pan Drain Plug	Use new seal: 22.0 ft-lbs
Oil Pump to Cylinder BLock Bolts/Studs	80.0 inch lbs. ft-lbs

Chassis torques

Lug Nuts

89 ft-lbs

Ignition

Cylinder Firing Order	1-4-3-6-2-5
Cylinder Firing Order	1-5-4-8-6-3-7-2

Battery & A/C

Refrigerant

R1234yf

Service checks

Fuel Pump Pressure Minimum	87.0 psi
Fuel Pump Pressure Maximum	116.0 psi
Residual Pressure	43.45 psi

Brakes

Brake Caliper Bolt to Carrier Torque	Front: NS, Rear: Use new bolts: 26.0 ft-lbs
ABS Sensor Torque	6.4
Minimum Pad Thickness	0.079" in
Vented Rotor Minimum Thickness for Replacement	Front: 1LL; Rear: 2ED; Front: 1LL; Rear: 2ED

Multi-step torque procedures OEM · verified

Cylinder Head — tightening sequence 1 stages

Completely install all bolts by hand. Step 2

22 ft. lbs

Cylinder Head — tightening sequence 1 stages

Completely install all bolts by hand. Step 2

22 ft. lbs

Exhaust Manifold to Cylinder Head Bolts — tightening sequence 1 stages

11.0 ft. lbs., Step 2: 22.0

11 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 mi	Brake Linings (inspect) · Engine Oil (drain & refill) · Engine Oil Filter (replace) · Tire Repair Kit Sealant (inspect)
Every 20,000 mi	Air Conditioning Evaporator Case Drain (inspect) · Body Water Drains (inspect) · Brake Line (inspect) · Cabin Air Filter (replace) · Door Hinge (lubricate) · Drive Axle Assembly (inspect)
Every 30,000 mi	Spark Plugs (replace)
Every 60,000 mi	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 A8 Quattro lead in one area — the electrical system, 1 of 5 reports (20%), well ahead of the next concern. None of this vehicle's 10 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.

Open recalls

NHTSA campaigns

1218

Service bulletins

Manufacturer communications

ODI investigations

Office of Defects Investigation

Owner complaints

0 involved a crash · 0 a fire

Owner complaints filed with NHTSA, by component

All 5 complaints on record, top 5 components.

Electrical System1

Power Train,Electrical System,Engine1

Fuel/Propulsion System1

Power Train1

Structure1

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 2 of 10 campaigns on record for this vehicle.

21V825000Back Over Prevention: Sensing System: CameraReported 20/10/2021

Volkswagen Group of America, Inc. (Audi) is recalling certain 2021 Audi A8 and S8, 2022 Audi A5 Sportback, A4 Sedan, E-Tron GT, Q3, Q5, RS6 Avant, A3 Sedan, S5 Sportback, Q5 Sportback, Q7, Q8, RSQ8, SQ7, SQ8, and S3… Remedy: Dealers will update the infotainment unit parameters, free of charge. Owner notification letters were mailed November 9, 2021. Owners may contact Audi customer service at…

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…

Technical service bulletins NHTSA · verified

Showing 5 of 1218 bulletins on record with NHTSA.

Bulletin	Date	Component	Summary
TSB_2079747_2	2026-06-30	Structure	This bulletin provides information regarding various complaints about front or rear door…
TSB_2076404_8	2026-06-29	Unknown Or Other	This bulletin provides a deployment overview for customer service packages MLB and MQB…
TSB_2074640_3	2026-06-26	Engine	This bulletin provides information when there is increased oil consumption; >0.5ltr/1000…
TSB_2074729_3	2026-06-23	Electrical System	This bulletin provides informationwhen noises/vibration are detected from front of…
TSB_2059335_7	2026-06-23	Electrical System	This 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 A8 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 battery Vehicles taking Equipped with 55TFSI Engine oil filter 06M115441G Engine air filter 4N0129620C Spark plug 0P2905601 Battery 000915089BC

Reference guides

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

Vehicle recalls & TSBs OBD-II trouble codes Torque specifications Maintenance schedules Fluid capacities & specs

Frequently asked

How much oil does the 2021 A8 Quattro take?

Equipped with 55TFSI of Audi 0W-20, per the factory manual.

Does the 2021 A8 Quattro have open recalls?

NHTSA lists 10 recall campaign(s) for this model year. Check your specific vehicle by VIN.