2018 Audi S4 — Full Specifications
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The 2018 Audi S4 is a saloon/sedan powered by a 3L 6-cyl turbo premium gasoline engine. It returns around 29 mpg (UK) / 24 mpg (US EPA) combined. Owners often keep a Audi S4 workshop manual to hand for servicing and repairs.
Full Specifications
| Engine | 3L 6-cyl turbo |
|---|---|
| Transmission | Automatic (AM-S8) |
| Fuel Type | Premium Gasoline |
| Powertrain | Conventional |
| Drive | All-Wheel Drive |
| Body Style | Saloon/Sedan |
| Passenger Volume (EPA) | 90 cu ft (2,549 L) |
| Luggage Volume (EPA) | 13 cu ft (368 L) |
| Fuel Economy (UK) | 29 combined / 25 urban / 36 extra-urban mpg |
| Fuel Economy (US EPA) | 24 combined / 21 city / 30 highway mpg |
| CO₂ Emissions | 232 g/km |
| EPA Greenhouse Gas Score | 5 / 10 (10 = lowest emissions) |
| EPA Est. Annual Fuel Cost | $3,400 (15,000 mi/yr, US prices) |
Engine & Transmission Options
EPA lists 1 configuration for the 2018 Audi S4, all with the 3L 6-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 |
|---|---|---|---|---|---|---|
| 3L 6-cyl turbo | Automatic (AM-S8) | All-Wheel Drive | 29 | 24 (21/30) | 232 | $3,400 |
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 90 cubic feet (about 2,549 litres) and luggage volume at 13 cubic feet (about 368 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 S4
Running Costs: 2018 Audi S4
Covering around 8,000 miles a year in a 2018 Audi S4 at 29 mpg combined, expect roughly 1,254 litres of fuel annually — multiply by your local price per litre for a cost estimate. For US owners, the EPA estimates about $3,400 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 S4 Safety Ratings (NHTSA)
No NHTSA crash-test rating is on record for this model year. The NHTSA rates only a subset of vehicles each year; you can browse every rated vehicle on our NHTSA Safety Ratings hub.
Recalls & Owner Complaints (NHTSA)
NHTSA lists 2 safety recall campaigns that include the 2018 Audi S4 (as of 6 October 2026). Most affected areas: Seats (1), Air bags (1). A campaign often covers several model years or models, so check your own VIN to see whether your car is affected.
- Seats — campaign 21V874000, reported 10 November 2021. Risk: A disabled passenger air bag increases the risk of injury in the event of a crash.
- Air bags — campaign 19V547000, reported 24 July 2019. Risk: A disabled passenger air bag increases the risk of injury in the event of a crash.
Owners have filed 7 complaints with NHTSA about the 2018 Audi S4. The most-reported areas are Engine (4), Suspension (1), Service brakes (1). That is well below the median of 16 complaints across the 11 Audi S4 model years in our data.
Used-buyer checklist for the 2018 Audi S4
Based on where NHTSA recalls and owner complaints cluster for this model year, these are the areas worth checking before you buy:
- Seats (1 recall campaign) — Check seat adjusters, head restraints and seat-mounted sensors work, and confirm seat recalls were completed.
- Air bags (1 recall campaign) — Confirm any air bag inflator or module recalls were completed — enter the VIN at nhtsa.gov/recalls.
- Engine (4 owner complaints) — Listen for unusual noise on a cold start, check for warning lights and ask for the service records.
- Suspension (1 owner complaint) — Listen for knocks over bumps and check tyre wear for signs of alignment problems.
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 S4's 29 mpg is 2 mpg above that make average. Its 232 g/km CO₂ figure is 19 g/km lower than the 251 g/km Audi average.
Of the 15 Audi S4 model years we cover, the 2018 is the most economical on its best configuration (29 mpg UK combined). See every Audi S4 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 S4
Frequently Asked Questions
What engine does the 2018 Audi S4 have?
It's fitted with a 3L 6-cyl turbo premium gasoline engine, paired with a automatic (am-s8) transmission.
What is the fuel economy of the 2018 Audi S4?
The most efficient configuration returns around 29 mpg (UK) combined, or 24 mpg on the US EPA cycle.
How much does the 2018 Audi S4 cost to fuel per year?
The US EPA estimates about $3,400 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 S4 have any recalls?
NHTSA lists 2 safety recall campaigns that include the 2018 Audi S4 (as of 6 October 2026). Most affected areas: Seats (1), 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 S4?
Among the 7 owner complaints filed with NHTSA, the most-reported areas are Engine (4 complaints), Suspension (1 complaint), Service brakes (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 S4 have?
EPA measures interior passenger volume at 90 cubic feet (about 2,549 litres) and luggage volume at 13 cubic feet (about 368 litres). These are US EPA interior-volume figures, which are measured differently from the UK boot-capacity numbers manufacturers quote.