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2018 Audi A6/S6

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2018 A6/S6.

Body PASSENGER CARTransmission Automatic (AM-S7)

The 2018 Audi A6/S6 is a sophisticated passenger‑car that sits on the platform’s hallmark blend of comfort and performance, powered by a robust engine that requires a 5.0‑quart fill of 5W‑40 oil to maintain its refined operation; it achieves an EPA rating of 25 city/34 highway/28 combined miles per gallon while delivering a smooth automatic (AM‑S7) drive. With only two owner complaints—primarily concerning the electrical system, an “unknown or other” category, and the fuel/propulsion system—and no recalls, this model year reinforces the A6’s reputation for solid reliability, positioning it as a dependable choice within the series.

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-40OEM · verified

Lug nut torque89 ft-lbsOEM · verified

EPA fuel economy25/34/28 mpgEPA · 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 sizeP255/40R19, P255/35R20OEM · 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	06K905601M
Battery	000915089BF alt 000915089G
Front wiper blades	8F1955426B alt 4G1955425B
Thermostat	079121119J alt 079198013
Cabin air filter	4H0819439

Full specifications

Engine, drivetrain, dimensions and economy.

Engine & drivetrain NHTSA vPIC

Transmission

Automatic (AM-S7)

Ratings & economy EPA / vPIC

EPA city / highway / combined	25 / 34 / 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 engine oil, DOT 4 brake fluid. Torque lug nuts to 89 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
Clutch Fluid	DOT 4
Clutch Fluid	DOT 4
Engine Coolant	Use Audi coolant part number G13TL-VW774J
Engine Coolant Capacity	10.5
Engine Coolant	Use Audi coolant part number G13TL-VW774J
Engine Coolant Capacity	12.7
Engine Coolant	Use Audi coolant part number G13TL-VW774J

Engine torques

Crankshaft Position (CKP) Sensor Bolt(s)	7.4 ft-lbs
Camshaft Position (CMP) Sensor Bolt(s)	7.4 ft-lbs
Crankshaft Position (CKP) Sensor Bolt(s)	7.4 ft-lbs
Camshaft Position (CMP) Sensor Bolt(s)	7.4 ft-lbs
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)	7.4 ft-lbs
Oxygen (O2S) Sensor Bolt(s)	30.0 ft-lbs

Chassis torques

Lug Nuts	89 ft-lbs
Lug Nuts	89 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	Audi
Spark Plug Torque	22 ft-lbs
Spark Plug Manufacturer	Audi
Spark Plug Torque	22 ft-lbs
Spark Plug Manufacturer	Audi

Battery & A/C

Oil Group	PAG
Oil Type	PAG
Oil Capacity	3.70-3.73 oz.

Service checks

Fuel Pump Pressure Minimum	72.5 psi
Fuel Pump Pressure Maximum	116.0 psi
Residual Pressure	43 psi
Fuel Pump Pressure Minimum	72.5 psi
Fuel Pump Pressure Maximum	116.0 psi
Residual Pressure	43 psi
Fuel Pump Pressure Minimum	72.5 psi
Fuel Pump Pressure Maximum	116.0 psi

Multi-step torque procedures OEM · verified

Front Wheel Hub — tightening sequence 1 stages

148.0 ft. lbs., Step 2: 180.0°

148 ft. lbs

Rear Wheel Hub — tightening sequence 1 stages

148.0 ft. lbs., Step 2: 180.0°

148 ft. lbs

Camshaft Bearing/Carrier Cap Bolts or Studs — tightening sequence 2 stages

Prep Gasoline engines

1	72.0 inch lbs.	72 in
2	90 degrees; Diesel engines: NS	90 degrees

Connecting Rod (Large End) Bearings — tightening sequence 1 stages

Prep Gasoline engines

1	33.0 ft. lbs., Step 2: 90 degrees; Diesel engines	33 ft. lbs
1	22.0 ft. lbs., Step 2: 90	22 ft. lbs

Connecting Rod (Large End) Bearings — tightening sequence 2 stages

Prep Gasoline engines

1	36.0 ft. lbs.	36 ft. lbs
2	90 degrees; Diesel engines	90 degrees
1	25.0 ft. lbs.	25 ft. lbs
2	90

Connecting Rod (Large End) Bearings — tightening sequence 2 stages

1	36.0 ft. lbs.	36 ft. lbs
2	90

Crankshaft Pulley and/or Damper Bolts — tightening sequence 1 stages

110.0 ft. lbs., Step 2: 90

110 ft. lbs

Crankshaft Pulley and/or Damper Bolts — tightening sequence 1 stages

15.0 ft. lbs., Step 2: 90 degrees. Replace.

15 ft. lbs

Crankshaft Pulley and/or Damper Bolts — tightening sequence 1 stages

110.0 ft. lbs., Step 2: 90

110 ft. lbs

Cylinder Head — tightening sequence 4 stages

Prep Do not re-use old bolts. · Long head bolts

1	Tighten all bolts finger tight.
2	30.0 ft. lbs.	30 ft. lbs
3	90 degrees	90 degrees
4	90 degrees; Short head bolts (located in front of head)	90 degrees
1	6.0 ft. lbs.	6 ft. lbs
2	90 degrees	90 degrees

Cylinder Head — tightening sequence 4 stages

Prep Do not re-use old bolts.

1	Tighten all bolts finger tight.
2	30.0 ft. lbs.	30 ft. lbs
3	90 degrees	90 degrees
4	90 degrees	90 degrees

Cylinder Head — tightening sequence 5 stages

Prep Do not re-use old bolts. · Long head bolts

1	Tighten all bolts finger tight.
2	22.0 ft. lbs.	22 ft. lbs
3	44.3 ft. lbs.	44.3 ft. lbs
4	90 degrees	90 degrees
5	90 degrees; Short head bolts (located in rear of head)	90 degrees
1	8.0 ft. lbs.	8 ft. lbs
2	90 degrees	90 degrees

Cylinder Head — tightening sequence 3 stages

1	30 ft. lbs.	30 ft. lbs
2	Turn 90 degrees	90 degrees
3	Turn 90 degrees.	90 degrees

Cylinder Head — tightening sequence 5 stages

1	30 ft. lbs.	30 ft. lbs
2	Turn 90 degrees	90 degrees
3	Turn 90 degrees	90 degrees
4	Front of head small bolts	9 ft. lbs
5	Turn 90

Engine Flywheel Bolts — tightening sequence 2 stages

1	44.0 ft. lbs.	44 ft. lbs
2	90

Engine Flywheel Bolts — tightening sequence 2 stages

1	44.0 ft. lbs.	44 ft. lbs
2	90

Engine Flywheel Bolts — tightening sequence 2 stages

1	44.0 ft. lbs.	44 ft. lbs
2	90

Exhaust Manifold to Cylinder Head Bolts — tightening sequence 2 stages

1	12 ft. lbs.	12 ft. lbs
2	18

Main Bearings — tightening sequence 1 stages

Prep Gas engines · Cap bolts: Step 1: 48.0 ft. lbs., Step 2: 90 degrees, Side bolts: Step 1: 15.0 ft. lbs., Step 2: 90 degrees · Diesel engines

48.0 ft. lbs., Step 2: 90

48 ft. lbs

Main Bearings — tightening sequence 3 stages

Prep Gasoline engines

1	33.0 ft. lbs.	33 ft. lbs
2	90 degrees; Diesel engines	90 degrees
1	22.0 ft. lbs.	22 ft. lbs
2	36.0 ft. lbs.	36 ft. lbs
3	180

Main Bearings — tightening sequence 3 stages

1	22.0 ft. lbs.	22 ft. lbs
2	36.0 ft. lbs.	36 ft. lbs
3	90

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 60,000 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 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 Latches, Locks & Hinges (lubricate) · Brake Line (inspect) · Cabin Air Filter (replace) · Drive Axle Assembly (inspect) · Engine Coolant System (inspect fluid level)
Every 40,000 mi	Transmission Assembly (drain & refill) · Transmission Fluid & Filter (replace)
Every 60,000 mi	Drive Belt (replace) · Engine Air Filter Element (replace) · Spark Plugs (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 A6/S6 dominate in one area — the electrical system,unknown or other,fuel/propulsion system, 1 of 2 reports (50%), well ahead of the next concern. None of this vehicle's 2 recall campaigns target the electrical system,unknown or other,fuel/propulsion system, so those reports read as owner-reported wear-and-tear rather than an acknowledged defect. 0 of the reports describe a crash and 1 a fire — a small share of the total, but worth weighing against the electrical system,unknown or other,fuel/propulsion 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

263

Service bulletins

Manufacturer communications

ODI investigations

Office of Defects Investigation

Owner complaints

0 involved a crash · 1 a fire

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

Overall★★★★★

Frontal★★★★★

Side★★★★★

Rollover★★★★★

Owner complaints filed with NHTSA, by component

All 2 complaints on record, top 2 components.

Electrical System,Unknown Or Other,Fuel/Propulsion System1

Air Bags1

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 2 of 2 campaigns on record for this vehicle.

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…

18V370000Air Bags:Sensor:Occupant ClassificationReported 04/06/2018

Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2013-2018 Audi S6 and S7, 2012-2018 A7 and A6 Sedan, and 2014-2018 RS7 vehicles equipped with basic seats (with or without heating). Stress or wear of… Remedy: Volkswagen will notify owners, and dealers will install a PODS system repair kit, free of charge. The recall began November 29, 2018. Owners may contact Audi customer service at…

Technical service bulletins NHTSA · verified

Showing 5 of 263 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_2082323_1	2026-06-10	Engine	This bulletin provides informaiton when the engine is not running smoothly, misfiring.
TSB_2052680_6	2026-06-04	Unknown Or Other	This Reporting Obligation requires technicains to contact the Technical Assistance Center…

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.

Vehicles taking 5.0 qt Engine oil filter 079198405D Engine air filter 4G0133843 Fuel filter 4G0201317B Spark plug 06K905601M

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 2018 A6/S6 take?

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

Does the 2018 A6/S6 have open recalls?

NHTSA lists 0 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 / 34 highway / 28 combined mpg.

2018 Audi A6/S6

Quick specs

Fitment & sizes

OE service part numbers OEM · verified

Full specifications

Engine & drivetrain NHTSA vPIC

Ratings & economy EPA / vPIC

Service quick specs OEM factory data

Lubricants & capacities

Engine torques

Chassis torques

Ignition

Battery & A/C

Service checks

Multi-step torque procedures OEM · verified

Factory maintenance schedule OEM · verified

Reliability & federal safety record

Owner complaints filed with NHTSA, by component

Recalls NHTSA · verified

Technical service bulletins NHTSA · verified

Common OBD-II trouble codes

VIN tools

Vehicles with shared specs

Reference guides

Related vehicles

Other years

Frequently asked