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2015 Audi S4
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Instant Overview
2015 Audi A4 / S4 / allroad B8.5
The sedan-and-wagon side of the B8.5 family splits into the 220-hp 2.0T A4 and allroad, then steps into the 333-hp supercharged S4. This is where most owners start when they want a daily-driven B8.5 that still has tuning headroom.
Powertrain
2.0T EA888 or 3.0 TFSI supercharged V6
Transmission
CVT on select front-drive A4, 6-speed manual, 8-speed Tiptronic, or 7-speed S tronic
Drivetrain
Front-wheel drive or quattro all-wheel drive, with allroad and S4 staying in the quattro lane
Body Style
Sport sedan and wagon
What Matters First
A4 is the practical entry point, S4 is the performance sweet spot, and allroad is the cargo-and-weather version with more ride height.
The big ownership split is 2.0T service history versus 3.0T cooling and PCV upkeep.
A clean Premium Plus example is usually the safest place to start before searching deeper packages.
Likely Next Tabs
Related Searches
2015 Audi A4 oil consumption
2015 Audi S4 DSG service interval
2015 Audi allroad tire size
Ownership notes
Fast Overview
Production context
Facelift-era sedan and wagon coverage for the 2015 lineup
Output
A4 / allroad: 220 hp and 258 lb-ft. S4: 333 hp and 325 lb-ft.
Engine codes
CAED or CPMB 2.0T for A4 / allroad, CTUB 3.0T for S4
Transmission mix
A4 spans CVT, 6MT, and 8AT. S4 stays 6MT or 7-speed S tronic.
Trim Comparison
A4 trims
Premium is the clean baseline. Premium Plus usually brings the best mix of lighting, tech, and used-market value. Prestige is for buyers who care about the fuller equipment set.
S4 trims
Think Premium Plus or Prestige plus option strategy, not a bargain-base configuration. Sport differential, wheel package, and service history matter more than trim badges alone.
allroad trims
Premium keeps the wagon simple, while Premium Plus and Prestige make more sense if you want the nicer lighting and cabin spec to match the price.
Specs Block
Oil capacity
A4 / allroad 2.0T: about 4.6 L / 4.9 qt. S4 3.0T: about 6.8 L / 7.2 qt.
Coolant capacity
Around 10.0 L on the 2.0T cars and 12.0 L on the S4 3.0T layout
Wheel and tire notes
A4 often starts at 245/45R17 or 245/40R18. S4 commonly runs 245/40R18 or 255/35R19. allroad centers on 18- and 19-inch wagon fitment.
Bolt pattern
5x112
Tow and cargo note
allroad is the useful-body-style pick here; sedan buyers usually care more about wheels, brakes, and winter setup than tow math.
Common Problems
2.0T cooling path
Water pump and thermostat work stays near the top of the list on A4 and allroad ownership.
Coolant smell after shutdown is a common first symptom.
3.0T PCV path
S4 owners often end up chasing PCV, idle quality, and vacuum-related symptoms before they chase bigger failures.
Useful to separate from supercharger-related noises or belt issues.
Front-end wear
Control-arm bushings, wheel bearings, and alignment-sensitive tire wear show up as mileage climbs.
A sorted suspension refresh changes the whole car.
Modding Notes
A4 / allroad Stage 1
The most useful first mod if the service history is solid.
Pair with fresh plugs and good coils.
S4 cooling and pulley strategy
Heat exchanger planning matters before chasing harder tunes.
The platform rewards measured builds more than random bolt-ons.
Suspension and brake refresh
Dampers, bushings, and pads deliver a bigger real-world gain than cheap cosmetic parts.
Especially true on daily-driven allroads and S4s.
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