The Mercedes-Benz ML350 Bluetec, later rebranded as the GLE350d, offered a compelling blend of luxury, capability, and fuel efficiency thanks to its diesel engine. However, not all model years were created equal. This guide aims to provide you with a clear understanding of which ML350 Bluetec years offer the best ownership experience and which ones you might want to approach with caution, helping you make an informed purchase decision in 2024.
The reliability and maintenance costs of these SUVs can vary significantly depending on the year and how well they were maintained. Understanding the common issues and improvements made over the years is crucial to avoiding potential headaches down the road.
| Model Year | Key Features & Improvements | Potential Issues & Concerns |
|---|---|---|
| 2011 | Introduction of the Bluetec diesel engine; 7-speed automatic transmission. | Potential for oil leaks; some reported issues with the AdBlue system. |
| 2012 | Minor interior refinements. | Same as 2011; potential for glow plug issues. |
| 2013 | No major changes from 2012. | Similar issues to 2011 & 2012; potential for turbocharger issues. |
| 2014 | Improved infotainment system. | AdBlue system failures become more prevalent; potential for diesel particulate filter (DPF) clogging. |
| 2015 | Last year of the ML350 Bluetec badge (later rebranded GLE350d); generally considered a more refined model. | AdBlue system issues persist, but potentially addressed with software updates; potential for oil cooler leaks. |
| 2016 (GLE350d) | Rebranded as GLE350d; minor styling updates. | Similar to late ML350 Bluetec models; potential for camshaft adjuster issues. |
| 2017 (GLE350d) | No major changes from 2016. | AdBlue system issues continue to be a concern; potential for high-pressure fuel pump failures. |
| 2018 (GLE350d) | Last year of the GLE350d with the OM642 engine; generally considered the most reliable year. | Fewer reported issues compared to earlier years; potential for minor electrical glitches. |
| 2019 (GLE300d) | New generation GLE with a 4-cylinder diesel engine | Lower power, different engine, different issues |
Detailed Explanations
2011: This marked the introduction of the ML350 Bluetec with its diesel engine and 7-speed automatic transmission. While groundbreaking at the time, it's one of the earliest models and therefore more prone to age-related issues. Pay close attention to potential oil leaks around the engine and transmission and thoroughly inspect the AdBlue system for proper functioning.
2012: The 2012 model year saw only minor interior refinements. Mechanically, it's very similar to the 2011 model, meaning it shares the same potential issues. Glow plug problems can surface in colder climates, leading to difficult starting.
2013: The 2013 ML350 Bluetec didn't introduce any significant changes from the previous year. This model shares the same potential issues as the prior years, including the possibility of turbocharger problems, which can be a costly repair.
2014: The 2014 model received an improved infotainment system. However, the AdBlue system failures become more prevalent in this year, a common complaint. Diesel Particulate Filter (DPF) clogging is another concern, especially if the vehicle was primarily used for short trips.
2015: As the last year of the ML350 Bluetec badge, the 2015 model is generally considered a more refined version of the previous years. While it still has the potential for AdBlue system issues, software updates may have addressed some of the earlier problems. Oil cooler leaks are another potential issue to watch out for.
2016 (GLE350d): The ML350 Bluetec was rebranded as the GLE350d in 2016, with minor styling updates. The core mechanicals remained largely the same, so the issues are similar to the late ML350 Bluetec models. Camshaft adjuster issues can occur, potentially leading to engine performance problems.
2017 (GLE350d): The 2017 GLE350d didn't see any major changes from the previous year. The AdBlue system continues to be a potential source of trouble. High-pressure fuel pump failures are another concern that emerged in this year, which can cause significant engine damage.
2018 (GLE350d): 2018 marked the last year of the GLE350d with the OM642 engine. It's generally considered the most reliable year of this engine. With fewer reported issues compared to earlier years, this model is often recommended. Even so, be aware of potential minor electrical glitches.
2019 (GLE300d): The 2019 GLE represents a new generation, featuring a new 4-cylinder diesel engine (GLE300d). This engine is less powerful than the older V6, and it has its own set of distinct issues, unrelated to the OM642. Focus on researching the specific issues of the OM654 engine.
Frequently Asked Questions
Which ML350 Bluetec year is the most reliable? The 2018 GLE350d (the last year of the OM642 engine) is generally considered the most reliable due to fewer reported issues compared to earlier years.
What are the most common problems with the ML350 Bluetec? Common problems include AdBlue system failures, oil leaks, diesel particulate filter (DPF) clogging, and potential turbocharger issues.
Is the AdBlue system expensive to repair? Yes, AdBlue system repairs can be costly, involving components like the pump, sensors, and injector.
Should I avoid the earlier ML350 Bluetec models? Not necessarily, but be prepared for potential maintenance and repairs due to their age and higher mileage. A thorough pre-purchase inspection is crucial.
What does the Bluetec designation mean? Bluetec refers to Mercedes-Benz's diesel technology designed to reduce emissions, using AdBlue (Diesel Exhaust Fluid) to neutralize harmful nitrogen oxides.
Is the GLE350d more reliable than the ML350 Bluetec? The later GLE350d models (especially 2018) are generally considered more reliable due to refinements and updates over the years.
What should I look for in a pre-purchase inspection? Check for oil leaks, AdBlue system functionality, DPF condition, turbocharger health, and overall engine condition. Also, review the vehicle's maintenance history.
How often should I change the oil in an ML350 Bluetec? Follow Mercedes-Benz's recommended oil change intervals, typically every 10,000 miles or once a year, using the correct specification oil.
Are parts readily available for the ML350 Bluetec? Yes, parts are generally readily available for the ML350 Bluetec and GLE350d, both from Mercedes-Benz and aftermarket suppliers.
Does the ML350 Bluetec have good fuel economy? Yes, the ML350 Bluetec offers good fuel economy for its size and class, typically achieving around 20-22 mpg in the city and 26-28 mpg on the highway.
Conclusion
Choosing the best year for a Mercedes-Benz ML350 Bluetec or GLE350d requires careful consideration of potential issues and the improvements made over time. While the 2018 GLE350d stands out as the most reliable option, a thorough pre-purchase inspection is essential for any model year to ensure you're making a sound investment and minimizing potential repair costs.