The BMW 335i, particularly the E90 generation, remains a sought-after performance car for enthusiasts. Its blend of power, handling, and relative affordability makes it an attractive option. However, not all model years are created equal. This guide will delve into the best and worst years of the 335i, providing valuable information for potential buyers to make an informed decision.
The 335i offered a powerful twin-turbocharged engine, and its popularity grew over the years. Understanding the nuances of each model year is crucial before making a purchase.
| Model Year | Engine | Key Considerations |
|---|---|---|
| 2007-2010 (N54) | 3.0L Twin-Turbocharged I6 | High Potential for HPFP, Injector, and Turbo Issues. Known for tuning potential but requires diligent maintenance. Check for oil leaks and coolant leaks. |
| 2011-2013 (N55) | 3.0L Single Twin-Scroll Turbocharged I6 | More reliable than N54. Still potential for oil leaks, but generally fewer major issues. Wastegate rattle can be a concern. |
| 2014-2015 (F30) (As 335i) | 3.0L Single Twin-Scroll Turbocharged I6 (N55) | Continued improvements in reliability. Still check for oil leaks and regular maintenance. This model is the last of the 335i badging before it became the 340i. |
Detailed Explanations
2007-2010 (N54) Engine: This generation of the 335i is powered by the N54 engine, a 3.0-liter twin-turbocharged inline-six. The N54 is known for its immense tuning potential. Its twin-turbo setup allows for significant power gains with relatively minor modifications. However, it is also notorious for its reliability issues, particularly concerning the high-pressure fuel pump (HPFP), fuel injectors, and turbochargers. The HPFP issue was so prevalent that BMW issued recalls and extended warranties on the component. The direct injection system can also lead to carbon buildup on the intake valves, requiring periodic cleaning. Potential buyers should be prepared for higher maintenance costs if considering an N54-powered 335i.
2011-2013 (N55) Engine: In 2011, BMW replaced the N54 with the N55 engine. While still a 3.0-liter inline-six, the N55 utilizes a single twin-scroll turbocharger instead of the N54's twin-turbo setup. The N55 is generally considered more reliable than the N54. It addresses some of the issues with the HPFP and injectors. However, it's not without its own quirks. Oil leaks from the valve cover gasket and oil filter housing are common. Additionally, the wastegate actuator on the turbocharger can develop a rattle, indicating wear. Despite these issues, the N55 offers a better balance of performance and reliability compared to the N54.
2014-2015 (F30) (As 335i): These later model years of the 335i, built on the F30 chassis, continue to use the N55 engine. By this point, BMW had refined the engine further, addressing many of the earlier issues. While oil leaks remain a possibility, the overall reliability is improved compared to earlier N55 models. The F30 chassis also offers a more modern interior and updated technology features. These model years represent the most reliable and refined versions of the 335i before the 340i replaced it. Keep in mind that in 2016, the 335i was replaced by the 340i, which used the B58 engine, a completely different and even more reliable powerplant.
High Potential for HPFP, Injector, and Turbo Issues (N54): The N54 engine, while powerful, is plagued by issues related to its fuel system and turbochargers. The High-Pressure Fuel Pump (HPFP) is notorious for failing prematurely, leading to rough running, long starts, and even engine stalling. The fuel injectors are also prone to leaking, causing similar symptoms. The turbochargers themselves can experience premature wear and failure, especially if the car has been heavily modified or not properly maintained. Addressing these issues can be costly, so a thorough inspection and service history are crucial before purchasing an N54-powered 335i.
Known for Tuning Potential but Requires Diligent Maintenance (N54): The N54 engine is a tuner's dream, capable of producing significant power gains with relatively simple modifications. However, this potential comes at a cost. The N54 is a complex engine that requires diligent maintenance to keep it running reliably, especially when modified. Regular oil changes, proper cooling system maintenance, and addressing any issues promptly are essential. Ignoring maintenance on a modified N54 can lead to catastrophic engine failure.
Check for Oil Leaks and Coolant Leaks (N54 & N55): Oil leaks are a common issue on both the N54 and N55 engines. The valve cover gasket, oil filter housing gasket, and oil pan gasket are all potential sources of leaks. Coolant leaks can also occur, particularly from the water pump and thermostat. These leaks should be addressed promptly to prevent more serious engine damage. A pre-purchase inspection by a qualified BMW mechanic can help identify any existing or potential leaks.
More Reliable Than N54 (N55): The N55 engine is generally considered more reliable than the N54. BMW addressed many of the issues with the fuel system and turbochargers in the N55 design. While the N55 still has its own quirks, it is less prone to major failures compared to the N54. This makes the N55 a more attractive option for buyers seeking a balance of performance and reliability.
Wastegate Rattle Can Be a Concern (N55): A common issue with the N55 engine is wastegate rattle. This occurs when the wastegate actuator on the turbocharger develops excessive play, causing a rattling noise, particularly at idle or low speeds. While the rattle itself may not immediately affect performance, it is an indication of wear and can eventually lead to reduced turbocharger efficiency. While not a critical issue, wastegate rattle should be addressed to prevent further degradation of the turbocharger.
Continued Improvements in Reliability (F30 N55): The later F30 335i models with the N55 engine represent the most refined and reliable versions of this powertrain. BMW continued to make improvements to the engine and chassis, addressing many of the earlier issues. These models offer the best combination of performance, reliability, and modern features.
Frequently Asked Questions
Which 335i engine is more reliable, the N54 or the N55? The N55 is generally considered more reliable than the N54 due to improvements in the fuel system and turbocharger design.
What are the common problems with the N54 engine? Common problems include high-pressure fuel pump (HPFP) failures, fuel injector leaks, turbocharger issues, and carbon buildup on the intake valves.
What are the common problems with the N55 engine? Common problems include oil leaks from the valve cover gasket and oil filter housing, and wastegate rattle on the turbocharger.
Is the 335i expensive to maintain? The 335i can be more expensive to maintain than some other cars, especially the N54 models. Regular maintenance and prompt repairs are crucial.
Which year of the 335i is the best to buy? The 2014-2015 F30 335i models are generally considered the best due to their improved reliability and modern features.
Are the 335i models good for tuning? Yes, the 335i, especially the N54 models, are known for their tuning potential, allowing for significant power gains with modifications.
What should I look for when buying a used 335i? Look for a well-maintained car with a complete service history, and have it inspected by a qualified BMW mechanic to check for any potential issues.
Conclusion
Choosing the right year of the BMW 335i depends on your priorities. If you're after maximum tuning potential and don't mind higher maintenance costs, an N54 model might be appealing. However, for a better balance of performance, reliability, and modern features, the later F30 335i models with the N55 engine are the recommended choice. Always prioritize a well-maintained example with a thorough pre-purchase inspection to avoid costly surprises.