The 2008 Mercedes-Benz S-Class with the 5.5L 8-cylinder is equipped with the M273 engine, a naturally aspirated V8 that produces 382 horsepower and 391 lb-ft of torque. This sophisticated engine features aluminum construction, variable valve timing on both intake and exhaust camshafts, and a composite intake manifold. The M273 utilizes a 90-degree V-angle design with dual overhead camshafts and four valves per cylinder. It’s paired with Mercedes’ 7G-Tronic seven-speed automatic transmission and delivers smooth, refined power delivery characteristic of the S-Class luxury sedan experience.

The 2008 Mercedes-Benz S-Class shares most parts with the W221 generation spanning 2007-2013 model years. Engine components from the 5.5L M273 V8 are compatible across 2006-2011 S-Class, CL-Class, and some E-Class models. Body panels, interior trim, and suspension components typically interchange within 2007-2010 model years, with some variations for mid-cycle refresh changes. Electrical components and modules may have different part numbers based on production dates and option packages. The COMAND system and some electronic modules had updates throughout the generation, so compatibility should be verified by VIN or part number matching.

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 M273 5.5L V8 is generally reliable when properly maintained, but has some known weak points. The balance shaft system can fail around 100,000-150,000 miles, causing expensive internal damage if not addressed. Regular oil changes every 5,000-7,500 miles are crucial, as is using high-quality synthetic oil. The engine’s timing chains and tensioners should be inspected regularly after 80,000 miles. Despite these concerns, many M273 engines exceed 200,000 miles with proper maintenance. Keep up with cooling system maintenance and address any oil leaks promptly to ensure longevity.