The 2005 Audi S4 is powered by a naturally aspirated 4.2-liter V8 engine producing 344 horsepower and 302 lb-ft of torque. This all-aluminum engine features direct fuel injection, variable valve timing, and a sophisticated intake manifold design. The engine is paired exclusively with a 6-speed manual transmission and Audi’s legendary Quattro all-wheel-drive system. This powerplant was known for its smooth power delivery and distinctive exhaust note, making it one of the most desirable naturally aspirated V8s of its era. The engine redlines at 7,000 RPM and provides strong acceleration throughout the rev range.

The 2005 Audi S4 shares most parts with the 2004-2009 B6/B7 generation S4 models. The 4.2L V8 engine components are largely interchangeable across these years, including major components like cylinder heads, pistons, and crankshafts. Body panels and interior components from 2004-2008 B6/B7 S4s are generally compatible. Some electrical components and control modules may require coding when swapped between model years. Suspension components, brakes, and drivetrain parts typically interchange within the B6/B7 generation. However, minor trim differences and updated part numbers may exist, so verification is recommended for specific components.

Parts availability changes daily. Call us at (603) 392-7313 or visit our online shop to check current inventory from this specific vehicle. If we have sold a part you need, our Parts Broker service can source it from our network of partner yards nationwide.

Yes! We ship parts from this vehicle and our entire inventory nationwide. Most orders ship within 1-2 business days via FedEx or freight carriers for larger components like engines and transmissions. Call (603) 392-7313 for a shipping quote on any part.

The 4.2L V8 in the S4 is generally reliable when properly maintained, but has some known weak points. The timing chain tensioners are the biggest concern and should be inspected regularly after 80,000 miles. Regular oil changes with high-quality synthetic oil are crucial for longevity. The direct injection system requires periodic carbon cleaning to maintain performance. When maintained properly, these engines can exceed 200,000 miles, but neglect can lead to expensive repairs. The engine itself is robust, but supporting systems like the secondary air injection and various sensors may require attention as the vehicle ages.