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2015 Audi A8/S8

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2015 A8/S8.

Body PASSENGER CAR

The 2015 Audi A8 and S8 are full-size luxury passenger cars that require a 7.2-quart oil fill, with recommended viscosities spanning 5W-40, 5W-30, and 0W-40. This model year recorded 31 owner complaints, predominantly centered on the engine, and was subject to five recalls. Within the model’s reliability history, these figures place the 2015 edition as a year with notable but not extreme concerns, where attentive engine care is particularly warranted.

Model year2018 2017 2016 2015 2014 2013 2003 2002 2001

Quick specs

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

Engine oil capacity7.2 qtOEM · verified

Engine oil type5W-40 / 5W-30 / 0W-40OEM · verified

Fitment & sizes

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

From the factory this vehicle uses a BCI 49 · 850 CCA battery, 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.

Battery groupBCI 49 · 850 CCAOEM · verified

Tire sizeP265/35R21OEM · verified

Wheel / rim9-J inOEM · verified

OE service part numbers OEM · verified

Engine oil filter	079198405D
Engine air filter	4H0129620M
Fuel filter	4H0201511A
Spark plug	079905626M
Battery	000915089BD alt 000915089J
Front wiper blades	4H1955426B alt 4H1955425B
Serpentine belt	079903137AJ
Thermostat	079121119J alt 079198013
Cabin air filter	4H0819439

Service quick specs OEM factory data

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

This engine holds 7.2 qt of 5W-40 / 5W-30 / 0W-40 engine oil, DOT 4 brake fluid. Torque the oil drain plug to 22.1 ft-lbs. The firing order is 1-5-4-8-6-3-7-2.

Lubricants & capacities

Brake Fluid	DOT 4
Engine Coolant	Audi coolant G13 TL-VW774J
Engine Coolant Capacity	15.8
Engine Oil	5W-40 · 5W-30 · 0W-40
Engine Oil Capacity	7.2 qt
Fuel Tank Capacity	21.7 gallons

Engine torques

Crankshaft Pulley and/or Damper Bolts	Diagonally tighten 11 ft-lbs
Engine Oil Pan Drain Plug	22.1 ft-lbs
Engine Valve Cover Bolts	7.2

Chassis torques

Steering Track (Rod End) Bolts

45.0 ft-lbs

Ignition

Cylinder Firing Order

1-5-4-8-6-3-7-2

Battery & A/C

Refrigerant	R134a
Oil Group	PAG
Oil Type	46
Standard BCI Group Number	49
Standard BCI Cranking Performance	850 cca

Service checks

Pressure Test	14.5 psi
Radiator Cap Pressure Relief	20-23 psi

Brakes

Brake Caliper Bolt to Carrier Torque	Front: 41; Rear: 26 Use; Rear: 26 Use
Brake Caliper Carrier to Hub Bolt Torque	Front: 145; Rear: 75 use; Front: 145; Rear: 74
ABS Sensor Torque	6.6 / NS
Minimum Pad Thickness	Front: 0.354; Rear: 0.315 Specifications

Multi-step torque procedures OEM · verified

Main Bearings — tightening sequence 1 stages

22.0 ft. lbs., Step 2: 36.0 ft. lbs., Step 3: 90

22 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 at 5,000 mi; spark plugs at 35,000 mi.

At 5,000 mi	Brake System (inspect) · Engine Oil (drain & refill) · Engine Oil Filter (replace) · Headlamp Washer Nozzle (inspect) · Headlamp Washer System (inspect fluid level) · Tire & Wheel Assembly (rotate)
Every 10,000 mi	Brake System (inspect) · Engine Oil (drain & refill) · Engine Oil Filter (replace) · Headlamp Washer Nozzle (inspect) · Headlamp Washer System (inspect fluid level) · Tire & Wheel Assembly (inspect)
At 15,000 mi	Air Conditioning Evaporator Case Drain (inspect) · Battery (inspect) · CV Joint Boot (inspect) · Cabin Air Filter (replace) · Drive Axle Assembly (inspect) · Engine Assembly (leak inspection)
Every 20,000 mi	Air Conditioning Evaporator Case Drain (inspect) · Battery (inspect) · CV Joint Boot (inspect) · Cabin Air Filter (replace) · Drive Axle Assembly (inspect) · Engine Assembly (leak inspection)
At 35,000 mi	Brake Rotor (inspect) · Door Hinge (lubricate) · Hood Latch (lubricate) · Spark Plugs (replace)
Every 40,000 mi	Brake Rotor (inspect) · Door Hinge (lubricate) · Hood Latch (lubricate) · Spark Plugs (replace)
At 55,000 mi	Engine Air Filter Element (replace) · Engine Air Filter Housing (clean)
Every 60,000 mi	Engine Air Filter Element (replace) · Engine Air Filter Housing (clean)
At 75,000 mi	Accessory Drive Belt (inspect)

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 2015 Audi A8/S8 dominate in one area — the engine, 15 of 31 reports (48%), well ahead of the next concern. None of this vehicle's 5 recall campaigns target the engine, so those reports read as owner-reported wear-and-tear rather than an acknowledged defect. 1 of the reports describe a crash and 0 a fire — a small share of the total, but worth weighing against the engine 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

1086

Service bulletins

Manufacturer communications

ODI investigations

Office of Defects Investigation

Owner complaints

1 involved a crash · 0 a fire

NHTSA crash-test rating federal NCAP · out of 5 stars

Rollover★★★★★

Owner complaints filed with NHTSA, by component

All 31 complaints on record, top 8 components.

Engine15

Service Brakes2

Suspension,Electrical System,Forward Collision Avoidance1

Visibility/Wiper1

Structure,Visibility/Wiper1

Unknown Or Other,Engine1

Power Train1

Power Train,Seats1

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 2 of 5 campaigns on record for this vehicle.

18V430000Fuel System, Gasoline:Delivery:Hoses, Lines/Piping, And FittingsReported 25/06/2018

Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2013-2015 Audi S8 and A8 vehicles. The fuel supply line for the high pressure fuel pump may become porous over time, resulting in a fuel leak. Remedy: Audi will notify owners, and dealers will replace the fuel line, free of charge. The recall began July 20, 2018. Owners may contact Audi customer service at 1-800-253-2834…

19V035000Fuel System, Gasoline:Fuel Injection System:Fuel RailReported 16/01/2019

Volkswagen Group of America, Inc. (Audi) is recalling certain 2016-2018 Q7, A6 and A7 vehicles, and 2015-2018 Audi A8 vehicles. The left and right fuel rails may leak fuel. Remedy: Audi has notified owners, and dealers will replace the left and right fuel rail, free of charge. The recall began February 28, 2019. Owners may contact Audi customer service at…

Technical service bulletins NHTSA · verified

Showing 5 of 1086 bulletins on record with NHTSA.

Bulletin	Date	Component	Summary
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_2028902_5	2026-06-23	Power Train	This bulletin provides informaiton when the transmission warning message appears in the…
TSB_2059335_7	2026-06-23	Electrical System	This bulletin provides information when there are noises from the area around the…
TSB_2082106_2	2026-06-23	Power Train	Ths bulletin provides informaiotn when the gearbox warning lamp is on, DTC P060A00 (8693)…

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.

Group 49 battery Vehicles taking 7.2 qt Engine oil filter 079198405D Engine air filter 4H0129620M Fuel filter 4H0201511A Spark plug 079905626M

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 2015 A8/S8 take?

7.2 qt of 5W-40, 5W-30 or 0W-40 meeting Audi specification 502 00 or equivalent., per the factory manual.

Does the 2015 A8/S8 have open recalls?

NHTSA lists 5 recall campaign(s) for this model year. Check your specific vehicle by VIN.