BMW 335i N55B30A 3.0L turbocharged petrol engine.

BMW 335i N55B30A 3.0L turbocharged petrol engine.

Specifications and Compatibility

BMW 335i N55B30A 3.0L turbocharged petrol engine is one of BMW’s most recognized modern performance engines, offering a perfect blend of smooth power delivery, efficiency, and reliability. As the successor to the twin-turbo N54, the N55B30A introduced a single twin-scroll turbocharger, high-precision fuel injection, and Valvetronic technology, improving throttle response, reducing turbo lag, and enhancing long-term durability.

This engine is ideal for customers looking for a premium-quality replacement or upgrade that delivers strong performance straight out of the box. Whether you’re restoring a 335i or enhancing a compatible BMW platform, the N55 engine provides excellent value and exceptional everyday drivability.

The N55B30A engine is commonly used in the BMW 335i (E90, E91, E92, E93) from 2010 to 2013, making it the direct and most popular application. It is also fitted across various BMW models, including the 135i, 235i, 535i, X3 35i, X5 35i, and certain Z4 35i models depending on production year and ECU configuration. This versatility ensures strong parts availability, easy servicing, and wide compatibility for customers in need of a reliable 3.0L BMW turbo engine for replacement or performance builds.

In terms of performance specifications, the N55B30A delivers approximately 300–306 horsepower and 400 Nm of torque, providing powerful acceleration and smooth high-RPM performance. Its 3.0L (2,979 cc) displacement, lightweight aluminium block, and direct injection system work together to create an efficient and robust platform capable of both daily driving comfort and sporty driving dynamics. The engine’s twin-scroll turbocharger improves exhaust scavenging and maintains strong power delivery across the rev range, while BMW’s variable valve and camshaft timing systems help optimize fuel economy and performance.

Common weaknesses and Maintenance. 

Although the N55 is considered more reliable than its predecessor, it does come with a few known weaknesses. Over time, high-pressure fuel pump (HPFP) wear can occur, potentially leading to hard starts or power loss if not addressed. Charge pipe failures are also common due to the factory plastic design, often cracking under high boost or age; upgrading to an aluminium pipe is a popular solution. Some engines may experience oil leaks from the valve cover or oil filter housing gasket, particularly at higher mileage. Additionally, wastegate rattle can develop on older turbochargers, although it usually impacts noise more than performance. Routine maintenance greatly reduces these issues.

To keep the N55B30A performing at its best, regular oil changes with high-quality synthetic oil, timely gasket replacements, and proactive cooling system checks are recommended. With proper care, the BMW 335i N55B30A engine remains one of the most dependable and enjoyable performance engines BMW has ever produced.

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