BMW 335i F30/F31 Buying Guide

Lewis O'Neill
2024-10-20T03:00:00+01:00

Looking to buy a BMW 335i F30/F31? Our comprehensive buyer’s guide covers everything you need to know about the 2012-2015 models with the N55 engine. Learn how to spot common issues like turbocharger wear, oil leaks, and cooling system failures, and get tips for evaluating stock and modified vehicles. Find the perfect 335i with expert advice tailored for enthusiasts.
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BMW 335i F30/F31 Buyer’s Guide (N55)

The BMW 335i, produced between 2012 and 2015, is a sought-after hatchback offering impressive performance, practicality, and the character of BMW’s N55 inline-six engine. Whether you're considering a stock model or one that's been modified, understanding the key aspects of the car is crucial to making an informed purchase. This guide will help you navigate what to look for when buying an 335i F30/F31.

Key Features of the 335i (N55)

The 335i features the N55 engine, a 3.0-liter turbocharged inline-six producing 320 horsepower in stock form. Buyers have the choice of a 6-speed manual or 8-speed ZF automatic transmission, both offering excellent performance. Rear-wheel drive is standard, but xDrive all-wheel-drive models are available in some markets. This car also boasts high-quality interiors and a sporty chassis, making it a versatile option for enthusiasts.

What to Look for When Buying

Maintenance History
Service records are critical when purchasing an 335i. Ensure the vehicle has had regular oil changes using high-quality synthetic oil, as this is vital for the health of the turbocharger and engine components. Confirm that other maintenance items, such as brake fluid, spark plugs, and coolant changes, were performed according to BMW’s recommended intervals. Neglected maintenance can lead to expensive repairs down the line.

Engine Health
Inspect the engine for signs of oil leaks around the valve cover, oil filter housing, or oil pan gasket. These are common areas for leaks in the N55. Listen for unusual noises from the engine, such as ticking or rattling, which could indicate timing chain issues, though these are less common on the N55 than on earlier BMW engines.

Turbocharger and Related Components
The turbocharger is a critical part of the 335i's performance. Check for excessive smoke from the exhaust, which could indicate turbo wear or failure. Inspect the charge pipe, as the factory plastic unit is prone to cracking. Many owners upgrade to an aftermarket aluminum charge pipe, which is a sign the previous owner addressed this weak point. JXL Performance recommends the MMX Charge Pipes

Cooling System
The electric water pump and thermostat on the N55 can fail with age, leading to overheating. Ask if these components have been replaced, particularly if the car has over 80,000 miles. An overheating N55 can lead to costly repairs.

Transmission and Differential
If considering a manual transmission, test the clutch for slippage and ensure smooth engagement. For automatic models, check for smooth shifts, as issues with the ZF automatic are rare but possible. Ensure that the differential operates quietly and that its fluid has been changed if the mileage is high.

Suspension and Brakes
Check for any knocking or clunking sounds from the suspension, which could indicate worn bushings or control arms. Inspect the brake pads and rotors for wear, as replacement can be costly. Look for aftermarket suspension modifications that may affect ride comfort or alignment. If you're looking to upgrade your suspension, you can find all of our options here

Modifications
Many 335i owners modify their cars to enhance performance. Common modifications include remapping the ECU, upgrading the intercooler, or installing a performance exhaust. While these can improve performance, they also increase wear on components like the turbo and drivetrain. Look for evidence of supporting modifications, such as upgraded cooling or strengthened components, which are necessary for reliability. Ensure that any tuning was performed by a reputable shop.

Interior and Electronics
Test all electronic systems, including the iDrive system, navigation, and climate controls. Check for excessive wear on the interior materials, particularly on the driver’s seat bolsters and steering wheel.

Red Flags to Avoid

Evidence of overheating or poor cooling system maintenance

Poorly executed modifications or a lack of supporting upgrades for performance enhancements

Incomplete or missing service records

Excessive smoking from the exhaust or significant oil consumption

Unusual drivetrain noises or hard shifting

Tips for Negotiation

If the car requires minor maintenance, such as replacing the charge pipe or performing a cooling system service, use this as leverage to negotiate the price. However, avoid cars with major unresolved issues, as repairs on the N55 can become costly.

Conclusion

The BMW 335i F30/F31 with the N55 engine is an excellent choice for those seeking a high-performance, practical vehicle. By carefully inspecting the car and verifying its maintenance history, you can find a well-maintained example that will provide years of enjoyment. Whether stock or modified, the 335i rewards owners who stay proactive with care and maintenance.