2015 Mercedes-Benz ML250 Is Leaking Oil

Identifying the Causes of Oil Leaks in Your 2015 Mercedes-Benz ML250 and How to Address Them

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Reviewed by
Andrew Hajjar
Written by RepairPal Car Genius
Updated January 14, 2025
0%
80% chance it's the
Oil System Components
0%
20% chance it's the
Engine Gaskets
The most common reasons a 2015 Mercedes-Benz ML250 is leaking oil are oil system component failure and leaking engine gaskets.
  • Oil System Components: A worn or damaged oil pump or filter can lead to low oil pressure, resulting in inadequate lubrication and potential engine damage.
  • Engine Gaskets: A worn or damaged engine gasket can lead to oil or coolant leaks, resulting in engine overheating or loss of lubrication.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2015 Mercedes-Benz ML250 is leaking oil?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

Oil pans don't wear out or break like other parts, they generally only need to be replaced because of external damage from an accident or an improperly tightened drain plug. The main symptom you will experience is an oil leak underneath the engine of your car. The oil that leaks from a damaged oil pan will range from dark brown to dark black. If the leak is large enough or occurs for long enough the oil level will be low enough to turn the oil pressure or low oil level warning light on.

A bad oil level sensor may cause a false reading of the engine oil level. The oil level warning light may illuminate even when the oil level (checked manually) is within an acceptable range. The warning light may also come on and off intermittently if the sensor is faulty. An error code may be sent to the PCM and a check engine light may come on the dashboard as well if the sensor is bad.

The engine oil pressure warning light will come on if the engine oil pressure is low, or if the oil pressure sensor is faulty. In either case, engine power may be reduced significantly. The check engine light may also illuminate, and an on-board diagnostic (OBD) trouble code will be stored in the vehicle's computer.

What are the initial diagnostic steps to identify the source of an oil leak in a 2015 Mercedes-Benz ML250?

To effectively identify the source of an oil leak in your 2015 Mercedes-Benz ML250, begin with a thorough visual inspection of the vehicle. Look for any oil spots or puddles on the ground beneath the car, as these can provide immediate clues about the leak's location. Next, turn your attention to the engine itself; inspect it closely for any visible signs of oil accumulation, particularly around common leak points such as gaskets and seals. Pay special attention to the lower rear case, as this area often collects oil if there is a leak. Additionally, don't overlook the breather area, which is another frequent source of oil leaks. By systematically examining these areas, you can pinpoint the source of the leak and take the necessary steps to address it, making your DIY repair process more efficient and effective.

What are the common causes of oil leaks in a 2015 Mercedes-Benz ML250?

When dealing with oil leaks in a 2015 Mercedes-Benz ML250, it's essential to understand the various common problems that can arise. One of the primary culprits is faulty seals and degraded gaskets, which can deteriorate over time and lead to leaks. Additionally, issues with the oil pan, such as cracks or loose bolts, can also result in oil escaping from the engine. Another frequent source of leaks is the oil filter; if it becomes loose or damaged, it can allow oil to seep out. Furthermore, worn or damaged components, including seals and gaskets, can exacerbate the problem. A particularly concerning issue is oil leaking into the spark plug wells, often indicating failing gaskets or O-rings that require immediate attention. For those with the OM642 engine, be aware that problems like melted motor mounts, stretched timing chains, and oil cooler seal failures can also contribute to oil leaks. Addressing these issues promptly is crucial to prevent further damage and ensure the longevity and performance of your vehicle.

How urgent is it to address the oil leak in my 2015 Mercedes-Benz ML250?

Addressing an oil leak in your 2015 Mercedes-Benz ML250 is not just a matter of routine maintenance; it is a critical issue that demands immediate attention. Ignoring an oil leak can lead to severe engine damage, reduced vehicle performance, and even safety hazards on the road. As oil levels drop, the engine may not receive adequate lubrication, increasing the risk of overheating and catastrophic failure. Moreover, the longer you wait to fix the leak, the more extensive and costly the repairs can become. Regularly inspecting your vehicle for signs of oil leaks and addressing them promptly is essential for maintaining the health and longevity of your ML250. By taking action now, you can avoid the risk of a breakdown and ensure your vehicle operates smoothly and safely.

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