AudiA8/S82018Overview/audi/a8-s8/2018/base/

2018 Audi A8/S8

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2018 A8/S8.

Body PASSENGER CAR

The 2018 Audi A8 and S8 are classified as passenger cars, and the model's owner-reported reliability record is remarkably thin, with just a single complaint logged for the entire model year. That lone filing centers on the Air Bags system, which is also the focus of the A8/S8's sole recall, leaving every other major system effectively unchallenged in the complaint data. Within the broader arc of A8 reliability history, this year emerges as an exceptionally low-complaint entry, a benchmark data point for researchers and shoppers weighing dependability across the nameplate. Even so, the singular air bag-related recall remains a focused point worth flagging in any thorough evaluation of this model year.

Model year201820172016201520142013200320022001

Quick specs

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

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 OE oil filter 079198405D. 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.

Tire sizeP265/40R20, P265/35R21, P275/35R21OEM · verified

OE service part numbers OEM · verified

Engine oil filter079198405D
Engine air filter4H0129620M
Fuel filter4H0201511A
Spark plug06K905601M
Battery000915089BF alt 000915089K
Front wiper blades4H1955425B alt 4H1955426B
Thermostat079121119J alt 079198013
Cabin air filter4H0819439

Service quick specs OEM factory data

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

Torque lug nuts to 89 ft-lbs, the oil drain plug to 18.0 ft-lbs. The firing order is 1-5-4-8-6-3-7-2.

Lubricants & capacities

Engine CoolantUse Audi coolant part number G13TL-VW774J
Engine Coolant Capacity15.9

Engine torques

Crankshaft Position (CKP) Sensor Bolt(s)7.4 ft-lbs
Camshaft Position (CMP) Sensor Bolt(s)7.4 ft-lbs
Engine Coolant Temperature (ECT) Sensor Bolt(s)9.0 ft-lbs
Oxygen (O2S) Sensor Bolt(s)30.0 ft-lbs
Knock Sense (KS) Bolt(s)14.75 ft-lbs
Intake Manifold to Engine Bolts6.6 ft-lbs
Oil Pan to Block Bolts7.4 ft-lbs
Engine Oil Pan Drain Plug18.0 ft-lbs

Chassis torques

Lug Nuts89 ft-lbs

Ignition

Cylinder Firing Order1-5-4-8-6-3-7-2
Spark Plug ManufacturerAudi
Spark Plug Torque22 ft-lbs

Service checks

Fuel Pump Pressure Minimum72.5 psi
Fuel Pump Pressure Maximum116.0 psi
Residual Pressure43 psi
Engine Compression159-203 psi @ RPM / Maximum Variation 44 psi
Engine Compression130-203 psi @ RPM / Maximum Variation 43 psi

Multi-step torque procedures OEM · verified

Front Wheel Hub — tightening sequence 1 stages
1148.0 ft. lbs., Step 2: 180.0°148 ft. lbs
Rear Wheel Hub — tightening sequence 1 stages
1148.0 ft. lbs., Step 2: 180.0°148 ft. lbs
Connecting Rod (Large End) Bearings — tightening sequence 2 stages
136.0 ft. lbs.36 ft. lbs
290
Engine Flywheel Bolts — tightening sequence 2 stages
144.0 ft. lbs.44 ft. lbs
290
Exhaust Manifold to Cylinder Head Bolts — tightening sequence 2 stages
112 ft. lbs.12 ft. lbs
218
Main Bearings — tightening sequence 3 stages
122.0 ft. lbs.22 ft. lbs
236.0 ft. lbs.36 ft. lbs
390

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; coolant every 20,000 mi. The big-interval services (every 20,000 mi for coolant, and the transmission fluid) are the ones owners most often skip — on a lower-mileage example, assume the original fluids are still in it and check them first.

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 Latches, Locks & Hinges (lubricate) · Brake Line (inspect) · Cabin Air Filter (replace) · Drive Axle Assembly (inspect) · Engine Coolant System (inspect fluid level)
Every 30,000 miSpark Plugs (replace)
Every 60,000 miEngine 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 2018 Audi A8/S8 dominate in one area — the air bags, 1 of 1 reports (100%), well ahead of the next concern. NHTSA has issued no recalls for this vehicle, so these are owner-reported concerns only. 1 of the reports describe a crash and 0 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.

1
Open recalls
NHTSA campaigns
578
Service bulletins
Manufacturer communications
0
ODI investigations
Office of Defects Investigation
1
Owner complaints
1 involved a crash · 0 a fire

Owner complaints filed with NHTSA, by component

All 1 complaints on record, top 1 components.

Air Bags1

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

No recall campaigns on record with NHTSA for this vehicle as of the last data refresh.

Technical service bulletins NHTSA · verified

Showing 5 of 578 bulletins on record with NHTSA.

BulletinDateComponentSummary
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…
TSB_2069331_72026-06-23Electrical SystemThis bulletin provides informaitn when there is a warning messsage; "Instrument cluster…
TSB_2082323_12026-06-10EngineThis bulletin provides informaiton when the engine is not running smoothly, misfiring.

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/S8. 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.

Reference guides

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

Frequently asked

Does the 2018 A8/S8 have open recalls?

NHTSA lists 1 recall campaign(s) for this model year. Check your specific vehicle by VIN.