BMW 4 Series F32 Reliability Guide: Which models to avoid and years to buy?

BMW 4 Series F32 Reliability Guide: Which models to avoid and years to buy?


BMW 4 Series F32 Buyer’s Guide: Best Engines to Buy and Which Ones to Avoid

Introduction

The BMW 4 Series F32 (2013–2020) remains one of the most popular choices for enthusiasts looking for a premium rear-wheel-drive sedan with sporty handling, especially when equipped with the M Sport package.

But not every F32 is created equal. Some engines are known for reliability, while others can be a costly headache. In this BMW 4 Series F32 buyer’s guide, we’ll go over the engines to avoid, the best options to buy, common problems, and maintenance tips to help you choose the right model.

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BMW 420i, 428i Pre-LCI (2013–2015) – N13 & N20 Engines

Overview

The early F32 models used the N13 (1.6L turbo 4-cylinder) and N20 (2.0L turbo 4-cylinder) engines. While fun to drive and easily tunable (a Stage 1 tune can push a 420i over 200 hp), these engines are infamous for their reliability issues.

Common Problems

  • Timing Chain Stretch/Failure – A major weak point. Plastic guides can break, leading to catastrophic engine damage. Any rattling noise at idle is a red flag.
  • Turbo Issues – Cracked vacuum lines and boost leaks cause power loss and misfires.
  • Excessive Oil Consumption – Can occur as early as 60k miles. Causes include:
    • Faulty PCV system (cheap fix).
    • Worn valve stem seals (blue smoke on acceleration).
    • Valve cover gasket leaks.
    • In severe cases, piston rings/cylinder wear → engine rebuild needed.
  • Coolant Leaks – Often from the back of the block, hard to spot without inspection.

👉 Verdict: These early 4-cylinder F32 models are best avoided unless the engine has been rebuilt or meticulously maintained.

 

BMW 418i & 420i LCI (2016–2019) – B38 3-Cylinder Engine

The B38 turbo 3-cylinder replaced the N13. Surprisingly, it’s much more reliable, with only rare reports of timing chain or thermostat issues.

👉 Verdict: A decent choice if you don’t mind the 3-cylinder character.

 

BMW 428i LCI (2016–2019) – B48 4-Cylinder Engine

The B48 engine solved most of the N20’s issues. BMW redesigned the timing chain system, making it far more durable.

Things to Check

  • Occasional coolant leaks (upper hose, oil filter housing).

👉 Verdict: A solid, reliable choice for daily driving and light tuning.

 

BMW 435i (2012–2015) – N55 6-Cylinder Engine

The N55 inline-6 is beloved for its smooth power delivery and tuning potential. Reliability is generally good.

Common Issues

  • Carbon buildup on intake valves (common with direct injection).
  • Oil leaks (valve cover, oil filter housing, oil pan gasket).

👉 Verdict: A strong and reliable option if well maintained.

 

BMW 440i / M440i (2016–2019) – B58 6-Cylinder Engine

The B58 engine is one of BMW’s best modern engines, often called the “German 2JZ” because it responds so well to tuning. Stock, it’s powerful and smooth, but with just a tune it can easily hit 400+ hp.

👉 Verdict: The most reliable gasoline option. Highly recommended.

 

BMW 420d Pre-LCI – N47 Diesel Engine

The N47 diesel had notorious timing chain issues in earlier BMWs. Thankfully, in the F32, BMW improved the design significantly (2011+). By 2015, the chain issue was eliminated.

👉 Verdict: Post-2013 models are safe. Good efficiency and reliability if serviced properly.

 

BMW 418d, 420d LCI – B47 Diesel Engine

The B47 diesel is even more efficient, reliable, and smoother than the N47.

👉 Verdict: A very good option for high-mileage drivers.

 

BMW 430d & 435d – N57 Diesel Engine

The N57 inline-6 diesel powering the 330d and 335d is considered one of the best engines of the F32 lineup. It’s strong, efficient, and long-lasting.

Key Watchpoints

  • Timing chain can still be an issue at very high mileage (>90k miles).
  • Regular oil changes are critical for turbo and chain health.
  • ZF 8-speed automatic transmission is excellent but benefits from fluid changes every 60–70k miles.

👉 Verdict: Among the most reliable F32 options. Great for performance and long-distance driving.

 

Final Recommendations

Models to Avoid

  • BMW 420i, 428i (2012–2015, N13/N20 engines)

Best Models to Buy

  • BMW 428i (2016–2019, B48 engine)
  • BMW 435i (N55) & 340i (B58)
  • BMW 420d (post-2013 N47 or B47)
  • BMW 430d & 435d (N57)

Maintenance Tips

  • Don’t rely on BMW’s long oil change intervals.
    • Change oil every 6,000 miles on gas engines.
    • Change oil every 9,000 miles on diesel engines.
  • Use the correct BMW-approved oil viscosity.
  • Always check service history before buying.

 

Conclusion

The BMW 3 Series F32 is a fantastic sports sedan when you pick the right engine. The early 4-cylinder models (N13/N20) should be avoided due to reliability concerns, while the later B48, B58, and N57 engines are strong, reliable choices that combine performance with durability.

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