The 2004 BMW 325i is equipped with BMW’s M54B25 2.5-liter inline-6 naturally aspirated engine producing 192 horsepower and 181 lb-ft of torque. This aluminum engine features BMW’s Double-VANOS variable valve timing system on both intake and exhaust camshafts, providing smooth power delivery and good fuel economy. The M54 engine is known for its refined operation and linear power band, making it an excellent balance of performance and efficiency. It requires premium fuel and regular maintenance including frequent oil changes every 7,500 miles to maintain optimal performance and longevity.

The 2004 BMW 325i shares most parts with the E46 generation 3 Series produced from 1999-2005. Engine components from the M54 2.5L are compatible across 325i models from 2001-2005, while many suspension, brake, and interior parts interchange throughout the entire E46 run. Some early 1999-2000 models used different engine management systems, so electronic components may not be compatible. Body panels, lights, and trim pieces are generally interchangeable within the sedan body style, though facelift changes in 2002 affected some exterior components. Always verify part numbers for critical components like airbags and engine management modules.

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 M54B25 2.5L engine is generally reliable when properly maintained, with many examples exceeding 200,000 miles. Key maintenance items include regular oil changes with quality synthetic oil, timely cooling system component replacement, and addressing VANOS issues early. The engine itself is robust, but supporting systems like the cooling system and VANOS require attention. Common failure points include the water pump around 80,000 miles and VANOS seals around 100,000 miles. With preventive maintenance and addressing known issues proactively, this engine provides excellent longevity and smooth operation throughout its service life.