2009 Mercedes-Benz GL550 Is Leaking Oil

Address Oil Leaks in Your 2009 Mercedes-Benz GL550 Effectively

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Reviewed by
Aisha
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 GL550 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 GL550 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 steps to diagnose the oil leak in a 2009 Mercedes-Benz GL550?

To effectively diagnose an oil leak in a 2009 Mercedes-Benz GL550, start by identifying any visible symptoms, such as oil stains or puddles beneath the vehicle, which can indicate the presence of a leak. Next, conduct a thorough visual inspection of the undercarriage and engine compartment, looking for any signs of oil accumulation or drips. If the engine appears dirty, cleaning it can help you better identify the source of the leak. After cleaning, apply leak tracing powder to the suspected areas, as this can illuminate the leak's origin during a subsequent test drive. Pay close attention to the results of the test drive, as they will guide you to the exact location of the leak. Once identified, you can proceed with the necessary repairs to resolve the issue. By following this systematic diagnostic approach, you can efficiently pinpoint and address oil leaks in your vehicle.

What are the common causes of oil leaks in a 2009 Mercedes-Benz GL550?

When diagnosing oil leaks in a 2009 Mercedes-Benz GL550, it's essential to understand the typical failure modes that can lead to this issue. One of the most frequent culprits is the deterioration of engine gaskets, which can result in oil seeping from various points in the engine. Additionally, oil leaks often originate from the back of the cylinder heads, where oil may escape and be misidentified as a valve cover leak. Another common source is the oil pan gasket, which can degrade over time, leading to significant leaks. It's also important to inspect seals and the oil filter, as faulty components in these areas can exacerbate the problem. If you notice oil pooling under your vehicle or a drop in oil levels, addressing these potential issues promptly can prevent more severe engine damage and costly repairs.

How urgent is it to address the oil leak in a 2009 Mercedes-Benz GL550?

Addressing an oil leak in your 2009 Mercedes-Benz GL550 is not just a matter of routine maintenance; it is a pressing concern that requires immediate attention. Oil is vital for lubricating engine components, and a leak can lead to a significant loss of oil, resulting in inadequate lubrication that may cause severe engine damage. Moreover, the presence of leaking oil creates a fire hazard, especially if it comes into contact with hot engine parts. Continuing to drive with an oil leak can dangerously lower your oil levels, increasing the risk of engine overheating and catastrophic failure. By promptly addressing the leak, you not only safeguard your engine's health but also prevent more extensive and costly repairs down the line. Therefore, if you notice any signs of an oil leak, it is crucial to act swiftly to maintain the performance and longevity of your vehicle.

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