The BMW 6 Series Gran Turismo, and specifically the 620d variant, offers a blend of luxury, practicality, and fuel efficiency. Choosing the right model year can significantly impact your ownership experience. This guide aims to provide clarity on the best and worst years for the BMW 620d, helping you make an informed decision.
| Model Year | Key Strengths | Potential Weaknesses |
|---|---|---|
| 2018-2019 | Improved engine reliability, enhanced infotainment system, refined suspension. | Potential for early software glitches, occasional issues with EGR cooler, high initial cost. |
| 2020-2024 | Minor updates to infotainment, further refinement of engine and transmission, improved fuel economy. | Lingering concerns about EGR cooler failures (though less frequent), potentially expensive repairs on newer models. |
| Avoid: | Pre-2018 Models (specifically early 2017 productions) | Higher risk of engine issues (timing chain, EGR), outdated infotainment. |
Detailed Explanations
Model Years 2018-2019: The Sweet Spot
These model years represent a significant improvement over the initial 6 Series Gran Turismo releases. BMW addressed many of the initial teething problems, particularly concerning engine reliability. The B47 diesel engine in these models is generally considered more robust than earlier iterations. The infotainment system also received a significant upgrade, offering a more intuitive and responsive user experience. The suspension was also refined, providing a more comfortable and controlled ride. However, be aware of potential early software glitches that might require dealer intervention and the possibility of EGR cooler failures, although less common than in earlier models. The initial purchase price tends to be higher compared to older models.
Model Years 2020-2024: Incremental Improvements
The 2020-2024 models represent incremental improvements over the 2018-2019 versions. While there were no major overhauls, BMW continued to refine the engine and transmission, resulting in slightly improved fuel economy and performance. The infotainment system received minor updates, ensuring it remained competitive. However, the risk of EGR cooler failures, while reduced, still exists. Furthermore, repairs on newer models can be potentially more expensive due to the higher cost of parts and more complex systems. These models also typically command a higher price on the used car market.
Why to Avoid Pre-2018 Models (Especially Early 2017 Productions)
Pre-2018 models, particularly those manufactured in early 2017, are generally considered the least desirable. These models are more prone to engine issues, specifically related to the timing chain and the EGR (Exhaust Gas Recirculation) system. EGR cooler failures were significantly more common in these early models, leading to potential engine damage and costly repairs. The infotainment system is also outdated compared to later versions, lacking some of the features and responsiveness found in newer models. While these models are typically cheaper to purchase, the potential for costly repairs makes them a riskier proposition. The B47 engine in these models wasn't as refined as later versions.
Engine Reliability (B47 Diesel)
The B47 diesel engine is the heart of the 620d. Later iterations of the B47, specifically those found in the 2018 and newer models, are generally more reliable than earlier versions. BMW addressed several issues, including those related to the timing chain and EGR system. However, it's crucial to maintain the engine properly with regular oil changes and servicing to ensure longevity. Look for models with a documented service history.
EGR (Exhaust Gas Recirculation) Cooler Issues
The EGR cooler is a component of the emissions control system designed to reduce NOx emissions. Unfortunately, the EGR coolers in some B47 diesel engines, particularly in early 620d models, were prone to failure. A failing EGR cooler can leak coolant into the engine, potentially causing significant damage. While BMW addressed this issue in later models, it's still a concern to be aware of. Check for any signs of coolant loss or white smoke from the exhaust, which could indicate a failing EGR cooler.
Infotainment System
The infotainment system is a crucial aspect of the driving experience. The 620d features BMW's iDrive system, which is generally considered user-friendly and feature-rich. However, the older versions of iDrive found in pre-2018 models are less responsive and lack some of the features available in later versions. The newer iDrive systems offer a more intuitive interface, faster processing speeds, and support for features like Apple CarPlay and Android Auto (depending on the specific model year and options).
Suspension and Ride Quality
The BMW 6 Series Gran Turismo is designed to offer a comfortable and refined ride. Later models benefited from suspension refinements that further improved ride quality and handling. The adaptive suspension option, available on some models, allows you to adjust the suspension settings to suit your driving preferences.
Fuel Economy
The 620d is known for its excellent fuel economy, thanks to its efficient diesel engine. Later models, particularly those from 2020 onwards, offer slightly improved fuel economy due to further engine and transmission refinements. However, fuel economy can vary depending on driving style and conditions.
Maintenance and Repair Costs
BMW vehicles are generally more expensive to maintain and repair than mainstream brands. The 620d is no exception. Regular maintenance, such as oil changes and servicing, is crucial to ensure longevity. However, more complex repairs can be costly, especially on newer models with advanced technology. Consider the potential maintenance and repair costs when budgeting for ownership.
Resale Value
The resale value of the 620d can vary depending on the model year, mileage, condition, and options. Later models typically hold their value better than older ones. However, factors such as the overall market demand for diesel vehicles can also influence resale value.
Frequently Asked Questions
Which year 620d is the most reliable?
The 2018-2019 models are generally considered the most reliable, offering a balance of improved engine reliability and a more modern infotainment system.
Are EGR cooler failures common in the 620d?
EGR cooler failures were more common in pre-2018 models, but the risk was reduced in later versions, though not entirely eliminated.
What is the average fuel economy of a 620d?
The 620d typically achieves excellent fuel economy, often exceeding 50 mpg on longer journeys.
Is the BMW 620d expensive to maintain?
Yes, BMW vehicles, including the 620d, tend to have higher maintenance and repair costs compared to mainstream brands.
Does the 620d have a timing chain issue?
Early models (pre-2018) were more prone to timing chain issues, but BMW addressed this in later versions.
What should I look for when buying a used 620d?
Check for a documented service history, signs of EGR cooler failure, and any potential software glitches.
Conclusion
Choosing the right year for your BMW 620d can significantly impact your ownership experience. While the 2018-2019 models offer a good balance of reliability and features, later models provide incremental improvements. Avoid pre-2018 models due to potential engine issues. Thorough research and a pre-purchase inspection are essential to ensure you make an informed decision.