The 2008 Audi S5 is a performance-oriented coupe that relies on precision engineering to deliver its signature driving dynamics. Under the hood lies the 4.2-liter V8 engine (code CAUA 1), a powerplant that demands high-quality lubricants to maintain smooth operation and peak performance. Proper maintenance begins with selecting the right viscosity and meeting the strict Audi and Volkswagen oil quality standards required for this vehicle. Using the correct fluids ensures that the engine, transmission, and cooling systems operate within their optimal parameters, protecting against the heat and stress generated by high-performance driving.
Recommended AMSOIL Products
- AMSOIL 5W-40 MS 100% Synthetic European Motor Oil – A premium synthetic oil designed specifically for the unique demands of gasoline, diesel, and hybrid European vehicles, featuring a precise blend of synthetic base oils and premium additives.
- AMSOIL 5W-40 FS 100% Synthetic European Motor Oil – An excellent choice for European engines, offering robust protection against wear and deposits while meeting the stringent oil quality standards required by Audi and Volkswagen.
- AMSOIL 0W-40 FS 100% Synthetic European Motor Oil – Provides superior cold-start protection and high-temperature stability, ideal for varying climate conditions while ensuring the engine receives the specific European formula it requires.
- MANN-FILTERS Oil Filter – Features premium media that offers improvements over original equipment manufacturer-branded filters, ensuring clean oil circulation and extended engine life for your 2008 Audi S5.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A unique poly-organic acid (OAT) formulation that protects all cooling system metals, gaskets, and hoses while exceeding original equipment manufacturer requirements for up to 150,000 miles.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated option that provides extended protection in passenger cars and light trucks.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Engineered to withstand the rigors of heavy towing and elevated temperatures, remaining fluid in sub-zero conditions to provide reserve protection during heavy use.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – A cost-effective option that protects against wear in automatic transmissions.
- AMSOIL 75W-90 Manual Transmission & Transaxle Gear Lube – Protects against increased heat and pressure with outstanding cold-flow properties.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Delivers excellent ABS and traction-control responsiveness with stable viscosity over a wide temperature range, ensuring reliable braking performance in all conditions.
- AMSOIL 75W-90 Long Life 100% Synthetic Gear Lube – Engineered for high-load gear and bearing protection, improving efficiency and extending seal life.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – Reduces friction and helps seals remain soft to prevent leaks, while offering strong anti-wear protection and excellent high-temperature performance for quiet operation.
Engine Oil Specifications and Capacities
Maintaining the health of the 4.2L 8-cylinder engine (Code CAUA 1) is paramount for longevity. The engine requires synthetic oil that meets the applicable Audi and Volkswagen oil quality standards. AMSOIL 5W-40 MS 100% Synthetic European Motor Oil, AMSOIL 5W-40 FS 100% Synthetic European Motor Oil, and AMSOIL 0W-40 FS 100% Synthetic European Motor Oil offer three primary viscosity grades suitable for various operating temperatures and driving styles: 5W-40, 5W-30, 0W-40, and 0W-30. If a synthetic oil meeting the specific Audi standard is unavailable in your region, it is crucial to select a viscosity grade that suits your local climate and seasonal conditions.
The total capacity for the engine, including a MANN-FILTERS Oil Filter change, is 9.3 quarts. After refilling the system, it is essential to check the oil level to ensure it is within the proper range. When replacing the drain plug, a torque of 18 ft/lbs is required to ensure a secure seal without damaging the threads. Choosing a high-quality synthetic European motor oil ensures that the engine remains protected against the thermal stress and high-RPM operation characteristic of the S5. The European formula includes precise blends of synthetic base oils and premium additives that outperform conventional oils in preventing sludge, reducing wear, and maintaining viscosity under extreme loads.
Filter Recommendations
A high-performance engine needs a high-performance filter to protect its internal components. For the 2008 Audi S5, the recommended MANN-FILTERS Oil Filter utilizes premium media that provides improvements over original equipment manufacturer-branded filters. By capturing contaminants effectively and maintaining optimal flow rates, it plays a critical role in extending the life of the engine oil and the engine itself. Using the correct filter ensures that debris does not circulate through the sensitive components of the V8 engine, preserving the integrity of the lubrication system.
Transmission and Gear Lubrication
The transmission system in the 2008 Audi S5 operates under significant stress, particularly if the vehicle is used for spirited driving. For the automatic transmission (Code 0B6), the total fill capacity is 11 quarts. AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is designed to withstand the rigors of heavy towing, elevated temperatures, and challenging terrain. It remains fluid even in sub-zero temperatures, providing essential protection during the initial warm-up phase and during heavy use. Alternatively, AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid offers protection against wear for everyday driving needs.
For manual transmission applications (Code 0B4), the capacity is 8 pints. The recommended fluid is AMSOIL 75W-90 Manual Transmission & Transaxle Gear Lube. This fluid offers outstanding cold-flow properties and is friction-modified to protect brass synchronizers. It provides excellent seal compatibility and inhibits rust and corrosion, ensuring long service life and smooth shifting. For the front differential (with automatic transmission), the capacity is 2.1 pints, and the rear differential (Code 0BC) holds 1.9 pints. AMSOIL 75W-90 Long Life 100% Synthetic Gear Lube is ideal for these components. Specifically engineered for high-load gear and bearing protection, this fluid improves efficiency and extends seal life while resisting rust and corrosion.
Cooling and Brake Systems
Proper cooling is vital for the V8 engine to prevent overheating. The cooling system capacity for the 2008 Audi S5 is 12.9 quarts. AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a phosphate-, nitrate-, nitrite-, silicate-, borate-, and amine-free formulation that protects all cooling system metals, gaskets, and hoses. It offers protection for up to 150,000 miles or 5 years, whichever comes first, and is compatible with all other antifreeze colors. For those preferring a concentrated option, AMSOIL Propylene Glycol Antifreeze and Engine Coolant provides extended protection up to 150,000 miles in passenger cars, surpassing standards for metallic corrosion and erosion.
Brake performance is critical for safety and control. The hydraulic AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid requirement for the 2008 Audi S5 is DOT 4, which corresponds to P/N B 000 750 M3. AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid offers excellent ABS and traction-control responsiveness. It maintains stable viscosity over a wide temperature range, ensuring consistent pedal feel and reliable braking performance in both hot and cold conditions. Additionally, the power steering system requires fluid that reduces friction and maintains seal health. AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid resists heat for long fluid life and provides strong anti-wear protection, ensuring quiet operation and preventing leaks.
About the Vehicle
The 2008 Audi S5 represents a significant moment in the brand’s history, marking the introduction of the S5 as a distinct model rather than just a badge-engineered version of the A4 or A5. Built on the MLB platform, the S5 is a luxury sports coupe that blends daily usability with genuine performance capabilities. Powered by a naturally aspirated 4.2-liter V8 engine producing approximately 350 horsepower, this vehicle delivers strong acceleration and a distinctive exhaust note that has garnered a dedicated following among enthusiasts. The S5 is known for its refined interior, advanced Quattro all-wheel-drive system, and precise handling dynamics that make it a favorite for both street driving and weekend autocross events.
Owners of the 2008 Audi S5 often praise the vehicle for its durability and build quality, attributes that are hallmarks of the Audi brand. The car is equipped with sophisticated technology for its era, including driver-selectable driving modes and a premium infotainment system. While it is a coupe, the S5 offers surprising rear-seat usability, making it a practical choice for those who occasionally need to transport passengers. The V8 engine is a robust powerplant that, when maintained with high-quality lubricants, can provide reliable service for many years. Its rear-wheel-biased all-wheel-drive system ensures excellent traction in various weather conditions, while the suspension tuning strikes a balance between comfort and sporty handling. This combination of luxury, performance, and practicality has solidified the 2008 Audi S5’s reputation as a beloved vehicle in the automotive community, appealing to drivers who demand the best from their machines.