2015 Mercedes-Benz GL450 Is Leaking Oil

Address Oil Leaks in Your 2015 Mercedes-Benz GL450 Effectively

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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 2015 Mercedes-Benz GL450 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 GL450 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 steps to diagnose an oil leak in a 2015 Mercedes-Benz GL450?

When diagnosing an oil leak in a 2015 Mercedes-Benz GL450, start by locating the leak, which involves a thorough inspection of the engine bay, under the vehicle, and around critical areas such as the oil pan, oil filter, and drain plug. Next, check the oil levels to confirm they are within the recommended range, as low levels may indicate a leak. Look for oil stains or puddles beneath the car, as these can provide clues about the leak's origin. Additionally, examine the gaskets and seals for any signs of wear or damage, as these components are common culprits for oil leaks. If the source remains elusive, consider using UV dye in the engine oil, which can help illuminate the leak under UV light. Finally, if you are unable to identify the leak or feel uncertain about your findings, consulting a qualified mechanic is advisable for a professional assessment and repair. By following these steps, you can effectively diagnose an oil leak in your vehicle and take appropriate action.

What are the common causes of oil leaks in a 2015 Mercedes-Benz GL450?

When dealing with oil leaks in a 2015 Mercedes-Benz GL450, 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 down over time, leading to leaks. Additionally, worn valve cover gaskets are another common source of oil leakage, often resulting in oil seeping from the top of the engine. The oil filter housing gasket can also fail, causing oil to leak around the filter area, while leaking oil cooler lines can contribute to oil escaping from the system. Lastly, various oil seals, including crankshaft and camshaft seals, may deteriorate and lead to leaks. Addressing these issues promptly is essential to prevent further engine damage and maintain optimal vehicle performance. Regular inspections and maintenance can help DIY enthusiasts catch these problems early, ensuring a smoother and more reliable driving experience.

How urgent is it to address the oil leak in my 2015 Mercedes-Benz GL450?

Addressing an oil leak in your 2015 Mercedes-Benz GL450 is not just a matter of routine maintenance; it is an urgent issue that requires immediate attention. Ignoring an oil leak can lead to a significant drop in oil levels, which compromises engine lubrication and can result in severe engine damage over time. Furthermore, the risks escalate as neglecting this issue may lead to engine overheating or even catastrophic engine failure, both of which can be costly to repair. Additionally, an oil leak poses a safety hazard, as oil can drip onto hot engine components, increasing the risk of a fire. By promptly addressing the oil leak, you not only safeguard your vehicle's performance and longevity but also protect yourself and others from potential dangers on the road. Therefore, it is crucial to take action as soon as you notice any signs of an oil leak in your GL450 to prevent further complications and ensure the vehicle remains in optimal condition.

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