2020 Mercedes-Benz GLS450 Is Leaking Oil

Troubleshooting Oil Leaks in Your 2020 Mercedes-Benz GLS450: Causes and Solutions for a Smooth Ride

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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 2020 Mercedes-Benz GLS450 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 2020 Mercedes-Benz GLS450 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.

An oil leak may be noted on the ground where the vehicle is parked. However, many vehicles have plastic trays underneath the engine that may catch leaking oil and conceal the leak. In such cases, a low oil level, a burning oil smell, or even smoke from oil burning in the engine bay may be noted.

»MORE: Signs of a bad oil pan gasket

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 the oil leak in a 2020 Mercedes-Benz GLS450?

When diagnosing an oil leak in a 2020 Mercedes-Benz GLS450, it's essential to adopt a systematic approach that prioritizes simpler methods before delving into more complex diagnostics. Start with a thorough visual inspection of the engine and the area beneath the vehicle, looking for any obvious signs of oil accumulation or dripping. This initial step can often reveal the source of the leak without further intervention. Next, check the oil levels to assess if there has been a significant loss, which can indicate a leak's severity. Pay close attention to the oil filter and drain plug, as these components are common culprits for leaks; ensure they are secure and free from oil residue. Additionally, inspect the gaskets and seals around the oil pan, valve cover, and oil filter housing for any signs of wear or damage. If the leak remains elusive, consider performing a pressure test on the oil system to detect hidden leaks. For a more advanced method, adding UV dye to the engine oil can help pinpoint the leak's exact location when illuminated with a UV light. By following these steps, you can effectively diagnose the oil leak and take appropriate action to resolve the issue.

What are the common causes of oil leaks in a 2020 Mercedes-Benz GLS450?

When diagnosing oil leaks in a 2020 Mercedes-Benz GLS450, it's crucial to understand the common culprits that may be at play. One frequent issue is a degraded or damaged oil pan gasket, which can deteriorate over time due to exposure to heat and oil, leading to leaks. Additionally, worn-out valve cover gaskets are another common source of leaks, as they can fail and allow oil to escape from the top of the engine. Another area to inspect is the oil filter housing gasket; if this component is faulty, it can result in oil leaking around the oil filter area, creating a mess. Furthermore, leaking oil cooler lines can develop over time, causing oil to escape and potentially leading to significant issues if not addressed. Lastly, various oil seals, such as those found around the crankshaft or camshaft, can degrade and contribute to oil leaks. By being aware of these potential issues and conducting regular maintenance checks, DIY enthusiasts can effectively identify and resolve oil leaks, ensuring the longevity and performance of their vehicle.

How urgent is it to address the oil leak in a 2020 Mercedes-Benz GLS450?

Addressing an oil leak in your 2020 Mercedes-Benz GLS450 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, which can ignite and lead to dangerous situations. Continuing to drive with an oil leak not only exacerbates the problem but can also lead to more extensive and costly repairs down the line. By promptly addressing the oil leak, you not only safeguard the performance and longevity of your vehicle but also ensure your safety on the road. Therefore, if you notice any signs of an oil leak, it is crucial to take action without delay to prevent further complications.

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