The Best Years For Bmw 335 And Some To Avoid

The BMW 335, particularly the E90 generation (2006-2013), holds a special place in the hearts of many enthusiasts. Known for its potent turbocharged engine and engaging driving dynamics, it offers a compelling blend of performance and practicality. However, not all 335 models are created equal, and certain years are known for specific reliability issues. This guide aims to help you navigate the complexities of the 335 market, highlighting the best years to buy and the ones to potentially avoid.

BMW 335 Model Year Overview

Detailed Explanations

N54 Twin-Turbo 3.0L I6: This engine, found in the 2007-2010 335i models, is lauded for its impressive power potential and responsiveness. The twin-turbo setup provides strong torque across the rev range, making it a joy to drive. However, it's also notorious for a number of reliability issues.

N55 Single-Turbo 3.0L I6: Introduced in 2011, the N55 replaced the N54. While still a 3.0L inline-six, it utilizes a single twin-scroll turbocharger and Valvetronic (variable valve lift) for improved efficiency and responsiveness. The N55 is generally considered more reliable than the N54, though it still has its own set of common problems.

B58 Single-Turbo 3.0L I6: The B58 engine represents a significant leap forward in BMW's inline-six design. Introduced in the 340i models starting in 2016, it boasts improved thermal management, a more robust design, and even greater power potential. It's known for its smooth power delivery and enhanced reliability compared to its predecessors.

High Pressure Fuel Pump (HPFP): This was a major issue plaguing the early N54 engines. The HPFP is responsible for delivering fuel at very high pressure to the direct injection system. Many owners experienced complete HPFP failures, resulting in long cranks, rough idling, and even engine stalling. BMW issued recalls and extended warranties to address this problem, but it remains a concern for older N54 models.

Injector Problems: Direct injection systems, like those used in the N54, are sensitive to fuel quality and can experience injector clogging or failure. Faulty injectors can lead to misfires, poor fuel economy, and reduced performance.

Wastegate Rattle: The N54's turbochargers utilize wastegates to regulate boost pressure. Over time, the wastegate actuators can wear down, resulting in a rattling noise, especially at low RPMs. While not necessarily a performance-hindering issue, it can be annoying.

Oil Leaks (Valve Cover Gasket, Oil Filter Housing Gasket): These are common issues across both the N54 and N55 engines. The valve cover gasket and oil filter housing gasket are prone to drying out and cracking over time, leading to oil leaks. These leaks are usually relatively inexpensive to repair but should be addressed promptly.

Water Pump Failure: The electric water pump used in both the N54 and N55 engines is a known weak point. The pump can fail suddenly, leading to overheating and potential engine damage. It's recommended to replace the water pump preventatively, especially on higher-mileage cars.

Carbon Buildup: Direct injection engines are susceptible to carbon buildup on the intake valves. Since fuel is injected directly into the combustion chamber, it doesn't wash over the intake valves, allowing carbon deposits to accumulate. This buildup can restrict airflow and reduce engine performance. The N54 is generally more prone to carbon buildup than the N55. Walnut blasting is a common method for cleaning the intake valves.

Charge Pipe Failure: The charge pipe connects the turbocharger to the intercooler. The factory plastic charge pipe is prone to cracking or breaking, especially when the car is tuned for increased boost. Upgrading to an aftermarket metal charge pipe is a common modification to prevent this issue.

VANOS Solenoid Issues: VANOS (Variable Valve Timing) is BMW's variable valve timing system. The VANOS solenoids can occasionally fail, leading to rough idling, reduced performance, and error codes.

Coolant Leaks: Similar to oil leaks, coolant leaks can develop over time due to the aging of hoses and seals within the cooling system. Regular inspection of the cooling system is recommended.

Best Years to Buy (and Why)

While no car is perfect, some 335 model years offer a better balance of performance and reliability than others. Here's a breakdown:

• 2011-2013 (N55 Engine): These years represent a sweet spot for the E9x generation. The N55 engine is generally more reliable than the N54, addressing many of the earlier engine's issues. While still susceptible to things like water pump failure and oil leaks, the N55 avoids the dreaded HPFP problems and is less prone to carbon buildup.

• 2016-2019 (340i with B58 Engine): If you're looking for the most reliable option, the 340i models with the B58 engine are the way to go. The B58 is a significantly more robust and advanced engine than the N54 and N55. While not entirely immune to issues, it's far less likely to experience major problems. These models also benefit from updated styling and technology.

Years to Potentially Avoid (or Approach with Caution)

• 2007-2010 (N54 Engine): While these models offer the thrill of the N54 twin-turbo engine, they also come with a higher risk of encountering the aforementioned reliability issues, particularly the HPFP, injector problems, and wastegate rattle. If you're considering one of these years, be sure to have a pre-purchase inspection performed by a qualified BMW mechanic and be prepared for potential maintenance costs.

Important Considerations Before Buying ANY 335

Regardless of the model year you choose, there are several important factors to consider before buying a used BMW 335:

• Maintenance History: A well-maintained 335 is far more likely to be reliable than one that has been neglected. Ask for complete service records and look for evidence of regular oil changes, coolant flushes, and other preventative maintenance.

• Pre-Purchase Inspection (PPI): This is crucial. A qualified BMW mechanic can identify potential problems that you might not be able to see on your own. A PPI can save you thousands of dollars in the long run.

• Tuning History: Be wary of heavily modified or tuned 335s. While tuning can unlock even more power, it can also put extra stress on the engine and other components, potentially leading to premature failure.

• Overall Condition: Look for signs of wear and tear, both inside and out. Check for rust, damage, and any unusual noises or vibrations during a test drive.

• Budget for Maintenance: BMWs, especially those with turbocharged engines, can be expensive to maintain. Be sure to factor in the cost of potential repairs and maintenance when budgeting for your 335.

Frequently Asked Questions

Which 335 is the most reliable? The 340i models (2016-2019) with the B58 engine are generally considered the most reliable due to the engine's robust design and updated technology.

What is the biggest problem with the N54 engine? The High Pressure Fuel Pump (HPFP) is the most notorious issue with the N54 engine, leading to stalling and performance problems.

Is the N55 engine better than the N54? Yes, the N55 engine is generally considered more reliable than the N54, addressing many of the earlier engine's issues like the HPFP.

How much does it cost to replace a water pump on a 335? The cost to replace a water pump on a 335 can range from $600 to $1000, depending on the shop and parts used.

Are oil leaks common on 335s? Yes, oil leaks from the valve cover gasket and oil filter housing gasket are common on both N54 and N55 engines.

How often should I change the oil on a 335? BMW typically recommends oil changes every 10,000 miles, but many enthusiasts recommend changing the oil more frequently, around every 5,000-7,500 miles, especially if the car is driven hard.

Conclusion

Choosing the right BMW 335 requires careful consideration. While the N54-powered models offer thrilling performance, they also come with a higher risk of reliability issues. The N55-powered models strike a better balance, while the 340i with the B58 engine represents the most reliable option. Thorough research, a pre-purchase inspection, and a realistic budget for maintenance are essential to ensuring a positive ownership experience.