Audi S8 Owner's Manual — Free PDF Download

This page provides access to the complete Audi S8 owner's manual in PDF format for every major generation. The S8 is Audi's flagship high-performance saloon — combining the full-size A8 platform with hand-built, high-output engines, sport-tuned air suspension, and an expanded suite of driver assistance technology. The correct manual for your model year explains every system, warning light, performance feature, and maintenance requirement specific to your vehicle.

Why Choosing the Correct Generation Matters

The Audi S8 has been built across four distinct generations — D2, D3, D4, and D5 — each representing a completely different vehicle in terms of structure, electronics, engine architecture, and available technology. The D2 generation used a naturally aspirated 4.2-litre V8, while the D5 uses a twin-turbocharged 4.0-litre V8 with a 48-volt mild-hybrid system and cylinder deactivation technology. These are fundamentally different powertrains requiring different service approaches, different fluid specifications, and different diagnostic procedures.

A manual from the wrong generation will reference different fuse box locations, different MMI menu structures, different suspension calibration procedures, and different oil approval codes. Always confirm your generation using the model year before downloading to ensure every figure and procedure in your manual applies to your exact vehicle.

Audi S8 Generations at a Glance

Use the table below to identify your generation before downloading. The platform code is also stamped on your vehicle identification plate in the engine bay.

What the Audi S8 Owner's Manual Covers in Detail

Audi's official S8 documentation goes considerably deeper than a standard A8 manual. The S-specific chapters cover performance driving systems, sport suspension calibration, launch control operation, and the additional cooling and brake systems that the high-output powertrain requires. Below is what each major section addresses.

The S8 Engine — What the Manual Explains

The powertrain is the defining element of every S8 generation, and the owner's manual devotes considerable space to explaining how to operate it correctly under different conditions. On D4 and D5 models, the cylinder-on-demand (COD) system automatically deactivates four of the eight cylinders under light throttle loads — typically at steady motorway cruise speeds — and reactivates them within milliseconds when more power is demanded. This process is imperceptible during normal driving but is displayed in the instrument cluster fuel economy screen when active.

The D5 S8 adds a 48-volt mild-hybrid system that captures braking energy through a belt-alternator-starter unit and stores it in a separate lithium-ion battery. This energy is used to power ancillaries and support the engine during acceleration, reducing the load on the main alternator and cutting fuel consumption during urban driving. The manual explains how this system interacts with the start-stop function and when it will and will not activate the engine restart.

For owners who track their S8 or drive hard on public roads regularly, the manual includes guidance on the correct warm-up procedure before sustained high-speed driving and the recommended idle-down period after returning from high engine loads — both of which protect the twin turbochargers and oil feed lines from thermal damage.

Understanding Dashboard Warning Lights on the S8

The Audi S8 shares most warning light symbols with the standard A8, but carries additional indicators specific to its performance systems. The active suspension warning — a car outline with wavy lines beneath it — can appear in yellow or red. A yellow suspension warning on D4 and D5 models typically indicates that one air spring has reported an anomalous pressure reading and the system has adjusted ride height compensation accordingly. A red suspension warning means the system has detected a fault that compromises vehicle stability and the car should be driven with increased caution to a workshop immediately.

The sport exhaust system fitted to D4 and D5 S8 models has its own status indicator that appears when the exhaust valve position changes between comfort and sport mode. This is a green information symbol and does not indicate a fault. However, if the exhaust valve motor develops a fault, a yellow warning appears in the instrument cluster and the system defaults to the open (louder) position permanently until repaired.

Active Air Suspension and Chassis Systems

Every Audi S8 generation has been fitted with adaptive air suspension as standard equipment. Unlike conventional coil spring suspension, the air suspension system continuously adjusts ride height and damping rates using pressurised air bladders at each corner and electronically controlled damper valves. The owner's manual explains how the system operates across the different Drive Select modes — Comfort, Auto, Dynamic, and Individual — and what changes between each mode in terms of ride height, damping firmness, and steering weight.

The D5 S8 introduced predictive active suspension, which uses front-facing cameras to scan the road surface ahead and pre-emptively adjust damper settings for detected potholes, speed bumps, and uneven surfaces before the wheels reach them. The manual explains how this system interacts with the navigation data — the S8 can also adjust suspension based on known road conditions stored in map data — and how to interpret the predictive suspension status display in the MMI.

Rear-wheel steering, also introduced on the D5 S8, turns the rear wheels by up to five degrees in the opposite direction to the front wheels at low speed to reduce the turning circle, and in the same direction at high speed to improve stability during lane changes. The manual documents the speed thresholds at which the system transitions between these modes and explains the self-calibration procedure that runs automatically each time the vehicle is started.

Audi MMI Touch Response and Virtual Cockpit Plus

The infotainment generation fitted to your S8 depends on its build year. D3 models use the MMI 3G High system with a rotary controller and four fixed function buttons. D4 models use the MMI 3G+ system, which added handwriting recognition on the central control pad and a higher-resolution 8-inch display. D5 models use the MMI Touch Response system — a dual-screen setup with a 10.1-inch upper display for navigation and media and an 8.6-inch lower display for climate, vehicle settings, and shortcuts. Both screens use haptic feedback that delivers a physical click sensation when a virtual button is pressed correctly.

The Virtual Cockpit Plus on D5 S8 models features a 12.3-inch fully digital instrument cluster that can display a full-width navigation map, a performance display showing boost pressure, oil temperature, and g-force readings, or the standard gauge layout depending on the selected drive mode. In Dynamic mode, the cluster automatically shifts to a sport-focused layout with a larger rev counter and a performance boost indicator. The manual explains how to customise which data fields appear in each drive mode and how to save preferences to a driver profile.

Quattro All-Wheel Drive on the S8

Every Audi S8 across all four generations has been fitted with Audi's permanent quattro all-wheel-drive system using a Torsen centre differential. Unlike the quattro ultra system used on some A4 and A6 models, the S8's Torsen quattro never disconnects either axle — both the front and rear axles are permanently driven at all times. Under normal conditions the torque split is 40 percent front and 60 percent rear on D4 and D5 models, giving the S8 a rear-biased handling balance that distinguishes it from front-biased quattro systems used in smaller Audi models.

D4 and D5 S8 models also offer the optional sport differential at the rear axle. This system actively distributes torque between the left and right rear wheels — directing more drive to the outside wheel during cornering to produce a mild yaw effect that rotates the car into the bend. The sport differential works in conjunction with the electronic stability programme rather than against it, and the manual explains how its behaviour changes between Comfort, Auto, Dynamic, and Individual drive select modes.

Because the S8 uses a permanent Torsen quattro system, it cannot be flat-towed with all four wheels on the ground. The manual documents the correct procedure for transporting the vehicle on a transporter or trailer, including the requirement to use wheel straps rather than chassis anchor points to avoid damaging the air suspension components.

Service Intervals and Fluid Specifications

The Audi S8 uses the same flexible service interval display system as other Audi models, but the high thermal and mechanical demands of the performance powertrain mean that oil degradation can occur sooner than the system estimates under frequent hard driving. Audi's S8 supplement recommends that owners who regularly use more than 75 percent of the available engine output — on track days, mountain passes, or sustained autobahn driving above 220 km/h — should shorten oil change intervals accordingly regardless of the dashboard reminder.

Engine oil specification is especially important on the twin-turbocharged V8 engines of the D4 and D5 S8. The high operating temperatures, forced induction pressures, and cylinder-on-demand system place specific demands on oil film strength and thermal stability. Only oils carrying the correct VW Group approval number should be used — not merely an oil of equivalent viscosity grade.

Tyre Pressures, Load Ratings, and Wheel Specifications

The Audi S8 is fitted from the factory with performance-rated tyres that carry a Y speed rating, confirming they are approved for sustained speeds above 300 km/h. Using tyres with a lower speed rating — even temporarily — is not recommended on a vehicle capable of exceeding 250 km/h without the optional limiter removed, and is documented as a safety restriction in the Wheels and Tyres chapter of every S8 manual generation.

Tyre pressures on the S8 vary by wheel size and load condition. D4 and D5 models were delivered with a range of factory wheel options from 20 to 22 inches, each requiring different inflation pressures. The correct figures for your fitted wheel size are printed on the label inside the driver's door jamb. The manual explains how to adjust these pressures for full five-passenger load, extended motorway driving, and winter tyre fitments, which typically use a smaller diameter wheel and a narrower tyre profile.

The D5 S8 features tyre pressure monitoring with individual corner readouts displayed in the Virtual Cockpit and the MMI. After any tyre inflation adjustment, wheel rotation, or new tyre fitment, the TPMS must be recalibrated through the Car menu. The manual documents this procedure step by step, as skipping it causes the system to continue reporting pressures based on the previous tyre's baseline rather than the newly inflated set.

Frequently Missed Sections in the S8 Manual

Several sections of the S8 owner's manual contain information that owners rarely discover until a problem arises. The drive select system allows creation of a fully custom Individual profile where damper firmness, steering weight, throttle response, exhaust valve position, and adaptive cruise control aggressiveness can each be set independently. This Individual profile is documented in the Drive Select chapter, not in the separate sections covering each of those individual systems — which is where most owners look first.

The night vision system fitted to D4 and many D5 S8 models uses a thermal camera mounted behind the front grille to detect pedestrians and large animals beyond the reach of the headlights. The manual explains the display overlay in the instrument cluster, how the system highlights detected heat signatures in yellow, and what conditions cause it to deactivate automatically — including high ambient temperature, heavy rain, and vehicle speeds below 15 km/h or above 130 km/h.

The massaging seat function, standard on most S8 trim levels, has a manual section dedicated entirely to its operation — including the different programme types, intensity settings, and the recommended maximum continuous session duration. Many owners use the massage function continuously on long journeys without realising the manual recommends a maximum of 15 minutes per session to avoid seat motor heat buildup in warm ambient temperatures.

How to Identify Your Exact Audi S8 Variant

The Vehicle Identification Number (VIN) is a 17-character code located at the base of the windscreen on the driver's side and on the compliance plate in the engine bay. For the S8, the VIN also distinguishes between the standard wheelbase and long-wheelbase variants where offered, and between market-specific equipment packages that affect which manual supplement applies to your vehicle. Audi produced different S8 specifications for European, North American, Middle Eastern, and Asia-Pacific markets — particularly regarding emissions equipment, lighting regulations, and available driver assistance features.

The engine code for each S8 generation is stamped on the engine block and printed on your service documentation. D4 S8 models used the CEU or CFS engine code depending on build date and market. D5 S8 models use the DKUF engine code for the standard 571 PS output variant. Knowing your engine code is critical when sourcing ignition components, fuel injectors, or turbocharger parts, as the S8's twin-turbo V8 shares its basic architecture with several other Audi and Volkswagen Group models that use different component specifications.

Your VIN can also be entered into the Audi owner portal to confirm the exact factory specification of your vehicle, including which optional driver assistance packages were fitted, what software version is currently installed on the MMI system, and whether any outstanding technical service bulletins apply to your car.

Frequently Asked Questions