2021 Mercedes-Benz GLB35 AMG Is Leaking Oil

Addressing Oil Leaks in 2021 Mercedes-Benz GLB35 AMG for Optimal Performance

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Reviewed by
Bo Fader
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 2021 Mercedes-Benz GLB35 AMG 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 2021 Mercedes-Benz GLB35 AMG 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 2021 Mercedes-Benz GLB35 AMG?

When diagnosing an oil leak in a 2021 Mercedes-Benz GLB35 AMG, it's crucial to follow a methodical diagnostic approach that emphasizes simpler assessments before tackling more complex issues. Begin with a comprehensive visual inspection of the engine bay and undercarriage, searching for any visible signs of oil accumulation or stains that could indicate the leak's source. Next, check the oil levels using the dipstick; a notable drop in oil level may signal a leak that requires prompt attention. Focus on the oil filter and drain plug, as these components are frequent sources of leaks; ensure they are properly secured and free from oil residue. Additionally, inspect the gaskets and seals, particularly the valve cover and oil pan gaskets, for any signs of wear or damage that could lead to leaks. If the source of the leak remains unclear, consider performing a pressure test on the oil system, which can help accurately identify the leak's location. For smaller, less visible leaks, adding UV dye to the oil can be an effective method to trace the source under UV light. If these steps do not yield results, consulting a qualified mechanic is advisable to ensure a thorough diagnosis and repair. By adhering to this structured approach, you can effectively identify and address oil leaks in your vehicle.

What are the common causes of oil leaks in a 2021 Mercedes-Benz GLB35 AMG?

When dealing with oil leaks in a 2021 Mercedes-Benz GLB35 AMG, 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 lead to significant oil loss if not addressed. Additionally, the valve cover gasket is another area to inspect, as wear and tear can cause oil to seep from the engine's top. The oil filter housing gasket is also a potential source of leaks, particularly around the oil filter, where improper sealing can occur. Furthermore, oil cooler lines may develop leaks over time, resulting in oil accumulation in the engine bay. Lastly, keep an eye on oil seals, especially those surrounding the crankshaft and camshaft, as cracks or damage can lead to persistent leaks. Regular inspections and timely maintenance are essential to catch these issues early, ensuring the longevity and performance of your vehicle.

How urgent is it to address the oil leak in my 2021 Mercedes-Benz GLB35 AMG?

When dealing with an oil leak in your 2021 Mercedes-Benz GLB35 AMG, the urgency of the situation cannot be overstated. Oil is vital for the lubrication of your engine, and a leak can quickly lead to a significant loss of oil, which may result in severe engine damage if not addressed immediately. Beyond the risk of engine failure, neglecting an oil leak can lead to more extensive repairs that could strain your budget. Additionally, oil dripping onto hot engine components poses a serious fire hazard, making it imperative to act swiftly. By promptly addressing the leak, you not only safeguard your vehicle's performance and efficiency but also ensure your safety on the road. Therefore, if you notice any signs of an oil leak, it is crucial to investigate and resolve the issue without delay to prevent further complications.

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