2020 Mercedes-Benz GLB250 Is Leaking Oil

Discover the Common Causes of Oil Leaks in Your 2020 Mercedes-Benz GLB250 and How to Resolve 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 2020 Mercedes-Benz GLB250 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 GLB250 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 2020 Mercedes-Benz GLB250?

To effectively diagnose an oil leak in your 2020 Mercedes-Benz GLB250, start by visually inspecting the engine bay and the area beneath the vehicle for any signs of oil accumulation. This initial step helps you locate the source of the leak. Next, check the oil level to determine if there has been a significant drop, which could indicate a more serious issue. 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, examine the gaskets and seals, particularly the valve cover gasket and oil pan gasket, as these areas are prone to wear and leakage. If the source remains elusive, consider adding UV dye to the engine oil and using a UV light to pinpoint the leak, as the dye will illuminate under the light. For a more thorough investigation, performing a pressure test on the oil system can help identify leaks in hoses and fittings. If these methods do not yield results, or if the problem appears complex, consulting a qualified mechanic is advisable to ensure a proper diagnosis and repair. By following this structured approach, you can efficiently identify and address oil leaks in your vehicle.

What are the common causes of oil leaks in a 2020 Mercedes-Benz GLB250?

When diagnosing oil leaks in a 2020 Mercedes-Benz GLB250, it's crucial to understand the common problems that may arise. One of the primary culprits is a degraded oil pan gasket, which can deteriorate over time and lead to significant oil loss. Additionally, issues with the valve cover gasket can result in oil seepage, creating visible leaks around the engine. Another frequent source of leaks is the oil filter housing gasket; if this component wears out, it can allow oil to escape from the engine. Furthermore, oil cooler seal leaks are not uncommon and can contribute to oil loss, while timing cover leaks can also be problematic, affecting the engine compartment. Addressing these issues promptly is vital to maintaining the vehicle's performance and preventing further damage, making regular inspections and maintenance essential for any DIY enthusiast looking to keep their GLB250 in top shape.

How urgent is it to address the oil leak in my 2020 Mercedes-Benz GLB250?

Addressing an oil leak in your 2020 Mercedes-Benz GLB250 is not just a matter of routine maintenance; it is an urgent issue that requires immediate attention. Oil is vital for lubricating engine components, and a leak can lead to a significant loss of oil, which may result in severe engine damage and costly repairs. Moreover, the presence of leaking oil poses a serious safety risk, as it can drip onto hot engine parts, increasing the likelihood of a fire. By neglecting this issue, you not only jeopardize the performance of your vehicle but also put yourself and others at risk on the road. Therefore, it is crucial to act swiftly and address any signs of an oil leak to ensure the safety and longevity of your Mercedes-Benz GLB250.

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