Audi S4

Sedan 1991–present 260–450 hp Petrol / TFSI / Mild Hybrid

The S4 blends everyday Audi refinement with genuine sports sedan performance — quattro grip, a thundering engine, and understated elegance.

265–450

Horsepower

4.5s

0–100 km/h

quattro

AWD Standard

1991

Year Introduced

Overview

The Audi S4 has been the definitive performance version of the A4 since 1991, evolving through five generations of increasingly sophisticated powertrains. The current B9 generation S4 uses a turbocharged 3.0 TFSI V6 producing 354 hp (facelift: 333 hp mild hybrid), paired exclusively with an 8-speed torque-converter automatic and full-time quattro AWD. This combination results in a 0–100 km/h time of around 4.7 seconds in a car that looks — from the outside — like a slightly upgraded A4.

In Azerbaijan, the S4 represents the ideal performance saloon for those who want capability without ostentation. The subdued exterior styling means it draws minimal attention on Baku's streets while the drivetrain can embarrass much flashier sports cars. The mild hybrid system on the B9 facelift (2019+) improves fuel economy meaningfully during the frequent stop-start conditions common in central Baku, while the mechanical torsen quattro system offers reassuring year-round traction.

Used S4 examples arriving via Germany or the UAE are increasingly common in Baku. The B8 generation (2008–2015) with the supercharged 3.0 TFSI V6 is available at accessible prices but requires careful maintenance of the supercharger intercooler and timing chain tensioners. The B9 (2016+) is more reliable and features far superior technology. Budget $1,500–2,200 annually for maintenance on a B9 S4 in Baku.

S4 in Pictures

Visual references for exterior styling, cabin design, and key details. Images fall back gracefully on load error.

S4 B9 facelift – Understated performance

S4 B9 – Sporty details, executive package

S4 Avant B8 – Wagon performance variant

S4 interior – Sport seats and flat-bottom wheel

Key Specifications

Engine: 3.0 TFSI V6 turbo (B9) / 3.0 TFSI V6 supercharged (B8)
Power: 354 hp (B9) | 333 hp mild hybrid (B9 facelift) | 333 hp (B8)
Torque: 500 Nm at 1,370–4,500 rpm (B9)
Transmission: 8-speed Tiptronic automatic (B9) / 7-speed S tronic (B8)
Drive: quattro AWD (torsen centre diff)
0–100 km/h: 4.7 seconds (B9)
Top speed: 250 km/h (limited)
Fuel consumption: 8.0–10.5 L/100km
Boot capacity: 480 litres
Kerb weight: 1,710 kg (B9)

Variant Comparison

Variant	Engine	Power	Drive	Best For
S4 B8 3.0 TFSI	3.0 TFSI V6 SC	333 hp	quattro	Budget S4 entry, character engine
S4 B9 3.0 TFSI	3.0 TFSI V6 Turbo	354 hp	quattro	Best standard S4 experience
S4 B9 MHEV	3.0 TFSI V6 MHEV	333 hp	quattro	Improved fuel economy with 48V system
S4 Avant B9	3.0 TFSI V6 Turbo	354 hp	quattro	Practical performance estate

Competitor Snapshot

Model	Strength	Compromise
BMW M340i	More engaging steering, lighter feel	Less power, no full-time AWD standard
Mercedes-AMG C43	More dramatic interior, AMG badge	Less reliable historically, higher insurance
Volvo S60 T8	PHEV option, more unique	Less powerful, less performance heritage

Cost-of-Ownership Estimator (Azerbaijan)

Annual distance (km)Fuel consumption (L/100km)Fuel price ($/L)Annual service budget ($)Annual insurance ($)Annual tires ($)

Annual fuel use: 1890 litres
Annual fuel cost: $1229
Total yearly estimate: $5429
Monthly average: $452

B8 supercharger belt and idler pulley should be inspected at 80,000 km — failure is expensive.
B9 engine is highly reliable but the 8-speed ZF automatic requires fluid service at 80,000 km.
Brembo brake upgrades from S4 are popular — budget $600 for front brake pads and discs per service.

Maintenance & Service in Azerbaijan

Oil service every 10,000 km — use Audi-approved 5W-30 synthetic for the 3.0 TFSI.
B8 supercharger intercooler coolant pump check at 60,000 km — failure causes overheating.
B9 48V mild hybrid belt starter generator check at 100,000 km intervals.
Full brake fluid flush every 2 years — the large Brembo calipers hold more fluid than standard A4.
quattro torsen diff is sealed-for-life but inspect CV joints and driveshafts at 80,000 km.
Air filter replacement every 20,000 km — critical in Baku due to dust levels.

Used S4 Buying Checklist

Request full service history — B8 timing chain tensioner failures have been documented.
Test launch control and all drive modes (Comfort, Auto, Dynamic) if equipped.
Check for supercharger whine on B8 cars — a slight whine is normal, grinding is not.
Verify quattro torsen engagement by testing on loose surface.
Inspect for oil leaks around the valve cover gaskets and oil separator (common on B8).
Check sport seats for bolster wear — driver's side bolster typically shows wear first.
Scan ECU for faults — misfires and cam sensor codes are common on high-mileage B8 units.

S4 FAQ — Azerbaijan Buyers

Q: Is the S4 significantly faster than the A4 45 TFSI in real-world driving?

Yes — the S4's 3.0 TFSI V6 and torsen quattro deliver meaningfully faster acceleration and better high-speed stability. The 0–100 km/h difference is about 1.5 seconds, but in-gear flexibility is where the V6 truly shines.

Q: Can I find a good S4 in Baku for under $30,000?

A 2015–2017 S4 B8 in good condition can be found in the $22,000–28,000 range. B9 models typically start from $35,000. All will be private imports.

Q: How much more expensive is S4 maintenance vs standard A4?

Expect 30–50% higher maintenance costs — higher-specification brakes, larger oil capacity, and V6 complexity add up. Budget $1,500–2,200 annually versus $900–1,400 for an A4.

Q: Does the S4 have any known issues to watch for?

B8: timing chain tensioners, supercharger intercooler pump, and valve stem seals. B9: reliable overall but 8-speed auto fluid maintenance is important. Both benefit from quality synthetic oil.

Q: Is the S4 Avant available in Azerbaijan?

S4 Avant wagons do appear occasionally via private import — they command a 10–15% premium over the sedan and are popular with buyers wanting performance plus practical load space.

Should You Buy the Audi S4?

A superb choice for performance-focused buyers who need everyday usability.

The Audi S4 is one of the most complete performance saloons on the Baku used market. It offers genuine speed, all-weather capability, and Audi interior quality without the compromises of a dedicated sports car. The B9 generation is the safer long-term bet; the B8 offers character at lower entry price but requires careful inspection. Either way, the S4 punches well above its visual weight.