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2015 Audi A6/S6

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2015 A6/S6.

Body PASSENGER CARTransmission Automatic (AV-S8)

The 2015 Audi A6/S6 is a passenger‑car model that uses an automatic transmission designated AV‑S8 and an engine requiring five quarts of oil, with approved viscosities including 5W‑40, 5W‑30 and 0W‑40. Its EPA fuel‑economy ratings are 25 mpg city, 33 mpg highway and 28 mpg combined. The model carries 21 total owner complaints and four recalls, with engine and engine‑cooling issues representing the most frequent problems.

Model year2018 2017 2016 2015 2014 2013

Quick specs

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

Engine oil capacity5.0 qtOEM · verified

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

EPA fuel economy25/33/28 mpgEPA · 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 sizeP255/40R19OEM · verified

Wheel / rim8.5-J inOEM · verified

OE service part numbers OEM · verified

Engine oil filter	079198405D
Engine air filter	4G0133843
Fuel filter	4G0201317B
Spark plug	079905626M
Battery	000915089K alt 000915089G
Front wiper blades	4G1955425B alt 8F1955426B
Serpentine belt	079903137AJ
Thermostat	079198013 alt 079121119J
Cabin air filter	4H0819439

Full specifications

Engine, drivetrain, dimensions and economy.

Engine & drivetrain NHTSA vPIC

Transmission

Automatic (AV-S8)

Ratings & economy EPA / vPIC

EPA city / highway / combined	25 / 33 / 28 mpg
Drivetrain	Front-Wheel Drive
Passenger volume	98 cu ft
Cargo volume	16 cu ft
Recommended fuel	Premium Gasoline

Service quick specs OEM factory data

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

This engine holds 5.0 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. Note the cylinder-head bolts finish on a torque angle (torque-to-yield) — they stretch permanently and should be replaced, not reused, during any head service.

Lubricants & capacities

Brake Fluid	DOT 4
Engine Coolant	Audi coolant G13 TL-VW774J
Engine Coolant Capacity	10.5
Engine Coolant	Audi coolant G13 TL-VW774J
Engine Coolant Capacity	12.7
Engine Coolant	Audi coolant G13 TL-VW774J
Engine Coolant Capacity	15.8
Engine Oil	5W-40 · 5W-30 · 0W-40

Engine torques

Crankshaft Pulley and/or Damper Bolts	Diagonally tighten 11 ft-lbs
Intake Manifold to Engine Bolts	7.3
Exhaust Manifold to Cylinder Head Bolts	1st step:
Exhaust Manifold to Cylinder Head Bolts	1st step:
Intake Manifold to Engine Bolts	6.6
Engine Oil Pan Drain Plug	22.1 ft-lbs
Engine Valve Cover Bolts	7.2

Chassis torques

Transfer Case Fill Plug	20.0 ft-lbs
Transfer Case Drain Plug	7.0 ft-lbs

Ignition

Cylinder Firing Order	1-3-4-2
Cylinder Firing Order	1-4-3-6-2-5
Cylinder Firing Order	1-5-4-8-6-3-7-2
Spark Plug Manufacturer	Denso
Spark Plug Torque	22 ft-lbs
Spark Plug Manufacturer	Denso
Spark Plug Torque	22 ft-lbs

Battery & A/C

Refrigerant	R134a
Refrigerant Capacity	19.36-20.80 lbs
Oil Group	PAG
Oil Type	46
Oil Capacity	3.70-4.40 oz
Standard BCI Group Number	49
Standard BCI Cranking Performance	850 cca
Optional BCI Group Number	95R

Service checks

Pressure Test	14.5 psi
Radiator Cap Pressure Relief	20-23 psi
Fuel Pump Pressure Maximum	87
Residual Pressure	44 psi
Regulated Fuel System Pressure (With Vacuum)	72.5-116 psi
Residual Pressure	43 psi
Regulated Fuel System Pressure (With Vacuum)	58
Regulated Fuel System Pressure (With Vacuum)	55

Brakes

Brake Caliper Bolt to Carrier Torque	Front: 22.0; Rear: 26 Use; Front: 22; Rear: 26
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

Cylinder Head — tightening sequence 5 stages

Prep Do not reuse old bolts. Use new bolts coated with clean engine oil.

1	30.0 ft. lbs.	30 ft. lbs
2	90 degrees	90 degrees
3	90 degrees	90 degrees
4	front bolts only 6.0 ft. lbs.	6 ft. lbs
5	90 degrees	90 degrees

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 55,000 mi.

At 5,000 mi	Brake System (inspect) · Diesel Emissions Fluid (fill) · Engine Oil (drain & refill) · Engine Oil Filter (replace) · Headlamp Washer Nozzle (inspect) · Headlamp Washer System (inspect fluid level)
Every 10,000 mi	Brake System (inspect) · Diesel Emissions Fluid (fill) · Engine Oil (drain & refill) · Engine Oil Filter (replace) · Headlamp Washer Nozzle (inspect) · Headlamp Washer System (inspect fluid level)
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) · Diesel Particulate Filter (inspect) · Drive Axle Assembly (inspect)
At 35,000 mi	Brake Rotor (inspect) · Door Hinge (lubricate) · Hood Latch (lubricate) · Transmission Fluid & Filter (replace)
Every 40,000 mi	Brake Rotor (inspect) · Door Hinge (lubricate) · Hood Latch (lubricate) · Transmission Fluid & Filter (replace)
At 55,000 mi	Drive Belt (replace) · Engine Air Filter Element (replace) · Engine Air Filter Housing (clean) · Spark Plugs (replace)
Every 60,000 mi	Drive Belt (replace) · Engine Air Filter Element (replace) · Engine Air Filter Housing (clean) · Spark Plugs (replace)
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 A6/S6 lead in one area — the engine & engine cooling, 4 of 21 reports (19%), well ahead of the next concern. That matters, because the engine & engine cooling are also the target of recall 18V-229 on this vehicle — so the single most useful check before buying or servicing one is confirming it was actually performed. 1 of the reports describe a crash and 0 a fire — a small share of the total, but worth weighing against the engine & engine cooling 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

1092

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

Overall★★★★★

Frontal★★★★★

Side★★★★★

Rollover★★★★★

Owner complaints filed with NHTSA, by component

All 21 complaints on record, top 8 components.

Engine & Engine Cooling4

Engine2

Unknown Or Other2

Steering2

Air Bags2

Wheels1

Fuel/Propulsion System1

Electrical System1

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 2 of 4 campaigns on record for this vehicle.

18V229000Engine And Engine Cooling:Cooling SystemReported 11/04/2018

Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2013-2017 Audi A5 Cabriolet, A5 Sedan and Audi Q5 vehicles, 2012-2015 Audi A6 vehicles and 2013-2016 Audi A4 Sedan and A4 allroad vehicles. These… Remedy: Audi will notify owners, and dealers will replace the pumps, free of charge. The recall began September 14, 2018. Owners may contact Audi customer service at 1-800-253-2834…

18V862000Electrical System:WiringReported 05/12/2018

Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2015-2016 Audi A6 Sedans and 2015 Audi A7 vehicles. The auxiliary heater electrical connector on these vehicles may have been incorrectly inserted into… Remedy: Volkswagen will notify owners, and dealers will inspect the auxiliary heater connector, replacing the auxiliary heater and connector, as necessary, free of charge. The recall…

Technical service bulletins NHTSA · verified

Showing 5 of 1092 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_2059335_7	2026-06-23	Electrical System	This bulletin provides information when there are noises from the area around the…
TSB_2082086_1	2026-06-22	Power Train	This bulletin provides informaiton when there is a leak on the oil hole between the…
TSB_2082323_1	2026-06-10	Engine	This 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 A6/S6. 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 5.0 qt Engine oil filter 079198405D Engine air filter 4G0133843 Fuel filter 4G0201317B 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 A6/S6 take?

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

Does the 2015 A6/S6 have open recalls?

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

What gas mileage does the A6/S6 get?

EPA figures are 25 city / 33 highway / 28 combined mpg.