2018 Audi S6 — Full Specifications
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The 2018 Audi S6 is a saloon/sedan powered by a 4L 8-cyl turbo premium gasoline engine. It returns around 22 mpg (UK) / 18 mpg (US EPA) combined. Owners often keep a Audi S6 workshop manual to hand for servicing and repairs.
Compared with the 2017 Audi S6: Fuel economy slips from 25 to 22 mpg (UK) combined on the most efficient configuration. The engine line-up listed by EPA is unchanged. It carries the same 5★ overall NHTSA rating.
Full Specifications
| Engine | 4L 8-cyl turbo |
|---|---|
| Transmission | Automatic (AM-S7) |
| Fuel Type | Premium Gasoline |
| Powertrain | Conventional |
| Drive | All-Wheel Drive |
| Body Style | Saloon/Sedan |
| Passenger Volume (EPA) | 98 cu ft (2,775 L) |
| Luggage Volume (EPA) | 16 cu ft (453 L) |
| Fuel Economy (UK) | 22 combined / 19 urban / 29 extra-urban mpg |
| Fuel Economy (US EPA) | 18 combined / 16 city / 24 highway mpg |
| CO₂ Emissions | 298 g/km |
| EPA Greenhouse Gas Score | 3 / 10 (10 = lowest emissions) |
| EPA Est. Annual Fuel Cost | $4,550 (15,000 mi/yr, US prices) |
Engine & Transmission Options
EPA lists 1 configuration for the 2018 Audi S6, all with the 4L 8-cyl turbo engine. The headline figures at the top of this page describe the most fuel-efficient configuration.
| Engine | Transmission | Drive | MPG (UK) | MPG (US) | CO₂ g/km | Fuel cost / yr |
|---|---|---|---|---|---|---|
| 4L 8-cyl turbo | Automatic (AM-S7) | All-Wheel Drive | 22 | 18 (16/24) | 298 | $4,550 |
MPG (US) shows combined, with city/highway in brackets. Highlighted row = the configuration used for the headline figures. Source: US EPA fueleconomy.gov.
EPA measures interior passenger volume at 98 cubic feet (about 2,775 litres) and luggage volume at 16 cubic feet (about 453 litres). These are US EPA interior-volume figures; they are measured differently from the boot capacity numbers UK manufacturers quote.
Owner Essentials for the 2018 Audi S6
Running Costs: 2018 Audi S6
Covering around 8,000 miles a year in a 2018 Audi S6 at 22 mpg combined, expect roughly 1,653 litres of fuel annually — multiply by your local price per litre for a cost estimate. For US owners, the EPA estimates about $4,550 a year in fuel for the most efficient configuration (15,000 miles, national average prices). Work out exact fuel costs with the fuel cost calculator on 247Calculators.
Convert between MPG and L/100km with the unit converters on 247QuickTools. Not sure what tyre size fits? 247TyreCheck explains tyre sizing.
Only need this car occasionally? See our buy vs rent comparison.
2018 Audi S6 Safety Ratings (NHTSA)
Recalls & Owner Complaints (NHTSA)
NHTSA lists 1 safety recall campaign that include the 2018 Audi S6 (as of 6 October 2026). Most affected areas: Air bags (1). A campaign often covers several model years or models, so check your own VIN to see whether your car is affected.
- Air bags — campaign 18V370000, reported 4 June 2018. Risk: If the PODS module malfunctions, the front passenger air bag may not deploy properly in the event of a crash, increasing the risk of injury.
Owners have filed 4 complaints with NHTSA about the 2018 Audi S6. The most-reported areas are Steering (2), Electrical system (1), Visibility/wiper (1).
Used-buyer checklist for the 2018 Audi S6
Based on where NHTSA recalls and owner complaints cluster for this model year, these are the areas worth checking before you buy:
- Air bags (1 recall campaign) — Confirm any air bag inflator or module recalls were completed — enter the VIN at nhtsa.gov/recalls.
- Steering (2 owner complaints) — Check for play, noise or heavy steering, and ask whether any steering recall work was done.
- Electrical system (1 owner complaint) — Test every switch, window, light and warning lamp on a test drive, and ask about battery or alternator replacements.
- Visibility (1 owner complaint) — Check wipers, washers and demisters work properly.
Source: US NHTSA recall and consumer-complaint databases, retrieved 6 October 2026. Complaints are unverified owner reports, not confirmed defects. Check any vehicle by VIN at nhtsa.gov/recalls, and see our guide to checking a used car for recalls.
How It Compares
Audi models in our database average about 27 mpg (UK) combined on their most efficient configuration; the 2018 Audi S6's 22 mpg is 5 mpg below that make average. Its 298 g/km CO₂ figure is 47 g/km higher than the 251 g/km Audi average.
Of the 14 Audi S6 model years we cover, the 2018 ranks 12th for combined fuel economy on its best configuration (22 mpg UK combined, against a high of 26 mpg). See every Audi S6 year side by side.
Last updated: · Data: US EPA (fueleconomy.gov) and NHTSA safety ratings 18 July 2026; NHTSA recalls and complaints 6 October 2026; Wikidata & curated EU catalogue 18 July 2026; European generation and engine data from Wikipedia 7 October 2026
Vehicle data sourced from manufacturer specifications. Always verify with your vehicle handbook or a qualified mechanic. This is a reference tool, not professional advice.
Recommended Accessories for the 2018 Audi S6
Frequently Asked Questions
What engine does the 2018 Audi S6 have?
It's fitted with a 4L 8-cyl turbo premium gasoline engine, paired with a automatic (am-s7) transmission.
What is the fuel economy of the 2018 Audi S6?
The most efficient configuration returns around 22 mpg (UK) combined, or 18 mpg on the US EPA cycle.
How much does the 2018 Audi S6 cost to fuel per year?
The US EPA estimates about $4,550 a year in fuel for the most efficient configuration, based on 15,000 miles of mixed driving and national average fuel prices. Your own cost will depend on mileage and local prices.
Does the 2018 Audi S6 have a good safety rating?
It holds an overall NHTSA rating of 5 stars, with 5 stars for frontal crash protection.
Does the 2018 Audi S6 have any recalls?
NHTSA lists 1 safety recall campaign that include the 2018 Audi S6 (as of 6 October 2026). Most affected areas: Air bags (1). A campaign often covers several model years or models, so check your own VIN to see whether your car is affected.
What are the most common problems reported for the 2018 Audi S6?
Among the 4 owner complaints filed with NHTSA, the most-reported areas are Steering (2 complaints), Electrical system (1 complaint), Visibility/wiper (1 complaint). Complaints are unverified owner reports, not confirmed defects, and raw counts rise with how many cars were sold.
How much interior and luggage space does the 2018 Audi S6 have?
EPA measures interior passenger volume at 98 cubic feet (about 2,775 litres) and luggage volume at 16 cubic feet (about 453 litres). These are US EPA interior-volume figures, which are measured differently from the UK boot-capacity numbers manufacturers quote.