BMW 325i E90 N52B25 2.5L Petrol Engine For Sale

BMW 325i E90 N52B25 2.5L Petrol Engine
Specifications, Compatible Vehicles.

The BMW 325i E90 N52B25 2.5L petrol engine is a well-balanced and smooth-performing powerplant that represents BMW’s dedication to refined engineering and driving pleasure. Introduced in the mid-2000s, this engine powered the E90-generation 3 Series and a range of other BMW models, becoming one of the most dependable naturally aspirated inline-six engines of its era. It delivers excellent performance, impressive fuel efficiency, and a refined sound signature that makes it a favorite among BMW enthusiasts and mechanics looking for a reliable replacement engine for sale in South Africa.

The N52B25 is a 2.5-liter inline-six DOHC petrol engine featuring Valvetronic variable valve lift technology and Double VANOS variable camshaft timing. It produces 160 to 170 horsepower (120–130 kW) and 230 Nm of torque, depending on the variant. Built with a magnesium-aluminum composite block and an aluminum head, the N52B25 was designed for lightweight efficiency without compromising structural integrity. Its smooth linear power delivery, responsive throttle, and balanced performance make it an ideal engine for everyday commuting as well as spirited driving. The engine’s sophisticated cooling and lubrication systems also contribute to its long-term durability and excellent fuel economy for a naturally aspirated six-cylinder.

This engine is found in several popular BMW models, including the BMW E90/E91 325i, E60 525i, Z4 E85/E86, and some X3 and X5 models equipped with similar engine management systems. Its widespread use across multiple BMW vehicles makes it one of the most common and easily serviceable engines on the market today. For those seeking a replacement BMW 325i N52B25 engine for sale, compatibility and installation are typically straightforward, especially when sourced from reliable second-hand or reconditioned engine suppliers.

Common Weaknesses & Maintenance Notes.

While the N52B25 is known for reliability, it does have a few common weaknesses that owners and buyers should be aware of. Valve cover gasket leaks are among the most frequently reported issues, often caused by heat-related wear. The electric water pump and thermostat can also fail over time, leading to overheating if not replaced promptly. Some owners experience oil consumption due to aging piston rings or valve stem seals, while DISA valve failures can affect performance. Fortunately, these problems are well-documented, and regular maintenance—such as using high-quality oil, timely cooling system inspections, and gasket replacements—can help keep the engine running smoothly for years.

For those in South Africa looking for a BMW 325i E90 N52B25 2.5L petrol engine for sale, this engine remains a top choice. It combines BMW’s classic inline-six refinement with modern efficiency, making it a perfect fit for anyone seeking performance, reliability, and long-term value in a premium replacement engine.

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