2015 Mercedes-Benz ML400 Is Leaking Oil

Address Oil Leaks in Your 2015 Mercedes-Benz ML400 Effectively

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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 ML400 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 ML400 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 steps should I take to diagnose the oil leak in my 2015 Mercedes-Benz ML400?

When diagnosing an oil leak in your 2015 Mercedes-Benz ML400, it's essential to adopt a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by locating the leak; inspect the area beneath your vehicle for any visible oil spots or puddles, as this can provide immediate clues about the leak's origin. Next, check your oil levels to determine if there has been a significant drop, which often indicates a leak. A thorough inspection of the engine components is crucial; pay close attention to the oil filter, oil pan, and valve cover gasket for any signs of oil residue. Additionally, examine the hoses and lines connected to the engine for cracks or loose connections that could be contributing to the leak. If the source remains elusive, consider using UV dye in the engine oil, which can help pinpoint the leak when illuminated with a UV light. Should these steps not yield results, consulting a mechanic or dealership for professional assistance is advisable to ensure a proper diagnosis and repair. By following this structured diagnostic approach, you can effectively identify and address the oil leak in your vehicle.

What are the common causes of oil leaks in a 2015 Mercedes-Benz ML400?

When dealing with oil leaks in a 2015 Mercedes-Benz ML400, it's crucial to understand the common culprits that may be at play. One frequent issue is the degradation of the oil pan gasket, which can wear out over time, leading to leaks. Similarly, valve cover gaskets are prone to deterioration, and their failure can result in oil escaping from the engine. Another area to inspect is the oil filter housing gasket; if this component fails, it can create leaks around the oil filter. Additionally, the seals surrounding the oil cooler can degrade, causing oil to leak in that area. Lastly, leaks may also occur around the timing cover due to gasket or seal issues. Addressing these leaks promptly is vital to prevent engine damage and ensure your vehicle runs smoothly. Regular maintenance and inspections can help you catch these problems early, allowing for effective DIY repairs.

How urgent is it to address the oil leak in my 2015 Mercedes-Benz ML400?

Addressing an oil leak in your 2015 Mercedes-Benz ML400 is not just a matter of routine maintenance; it is a critical issue that demands immediate attention. Ignoring an oil leak can lead to a cascade of problems, including severe engine damage due to inadequate lubrication. As oil levels drop, essential engine components may experience increased friction and heat, which can ultimately result in catastrophic engine failure. This not only compromises the performance of your vehicle but can also lead to costly repairs that could have been avoided with timely intervention. Moreover, oil leaks pose safety hazards, as oil can drip onto hot engine parts, creating a fire risk. Therefore, it is imperative to diagnose and repair any oil leaks as soon as they are detected to ensure the safety and longevity of your Mercedes-Benz ML400. Taking prompt action not only protects your investment but also ensures that your vehicle operates smoothly and safely on the road.

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