2009 Mercedes-Benz ML350 Is Leaking Oil

Identifying the Causes of Oil Leaks in Your 2009 Mercedes-Benz ML350 and How to Address Them

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Reviewed by
Devin Cabugcal
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 2009 Mercedes-Benz ML350 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 2009 Mercedes-Benz ML350 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.

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 steps to diagnose and fix an oil leak in a 2009 Mercedes-Benz ML350?

To effectively diagnose and fix an oil leak in a 2009 Mercedes-Benz ML350, it's essential to adopt a systematic diagnostic approach. Begin by thoroughly inspecting the engine to locate the source of the leak, focusing on common areas such as the oil pan, valve cover gaskets, oil filter housing, and oil cooler lines. Once you identify the leak, assess the condition of the oil pan and its bolts; tightening loose bolts or replacing a worn gasket can often resolve the issue. Next, examine the valve cover gaskets for any signs of damage, as these may need replacement to prevent further leaks. The oil filter housing should also be checked for leaks, and if necessary, replace any damaged gaskets or seals. Don’t overlook the oil cooler lines, as they can also be a source of leaks; inspect them closely and replace if needed. Before making repairs, clean the engine to eliminate any oil residue, which will help you accurately pinpoint the leak's origin. After addressing the identified issues with genuine Mercedes-Benz parts, monitor the repaired areas to ensure that the leak has been successfully resolved. This methodical approach not only aids in effective diagnosis but also helps maintain the vehicle's performance and longevity.

What are the common causes of oil leaks in a 2009 Mercedes-Benz ML350?

When diagnosing oil leaks in a 2009 Mercedes-Benz ML350, 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 lead to oil seeping from the bottom of the engine over time. Additionally, valve cover gasket leaks are another prevalent problem, where worn gaskets allow oil to escape onto the engine, creating visible leaks. The oil filter housing gasket can also fail, resulting in leaks around the oil filter area, while deteriorating oil cooler seals may cause oil to leak near the oil cooler assembly. Lastly, leaks from the timing cover can occur due to damaged gaskets or seals, leading to further oil seepage. Addressing these issues promptly is essential to prevent engine damage and maintain optimal vehicle performance, making regular inspections and maintenance vital for any DIY enthusiast looking to keep their ML350 in top shape.

How urgent is it to address the oil leak in my 2009 Mercedes-Benz ML350?

Addressing an oil leak in your 2009 Mercedes-Benz ML350 is not just a matter of routine maintenance; it is a pressing issue that requires immediate attention. An oil leak can significantly reduce the oil levels in your engine, leading to inadequate lubrication of vital components. This lack of lubrication can cause severe engine damage over time, resulting in costly repairs that could have been avoided. Furthermore, neglecting an oil leak can lead to engine overheating, which poses a serious risk of engine failure. The situation is compounded by safety concerns, as leaking oil can drip onto hot engine parts, creating a fire hazard. Therefore, it is crucial to act swiftly and address any signs of an oil leak to safeguard both your vehicle's performance and your safety on the road.

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