2021 Mercedes-Benz GLC63 AMG S Is Leaking Oil

Common Causes of Oil Leaks in Your 2021 Mercedes-Benz GLC63 AMG S and How to Address 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 2021 Mercedes-Benz GLC63 AMG S 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 GLC63 AMG S 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 potential causes of an oil leak in a 2021 Mercedes-Benz GLC63 AMG S, and how should I diagnose it?

When diagnosing an oil leak in your 2021 Mercedes-Benz GLC63 AMG S, it's essential to adopt a systematic diagnostic approach that prioritizes simpler checks before moving on to more complex assessments. Start with a thorough visual inspection of the undercarriage and engine bay to identify any visible signs of oil pooling or streaks. Next, monitor your oil levels regularly; a significant drop can indicate a leak. Pay close attention to the condition of gaskets and seals, as these components are often the culprits behind leaks due to wear over time. Inspect the oil pan and drain plug for any signs of damage or looseness, as these areas are prone to leaks. Additionally, examine the oil filter and its housing, as a faulty filter can lead to oil escaping. Don't overlook the oil cooler lines, which can degrade and develop leaks. If the source of the leak remains elusive, consider performing a pressure test to accurately pinpoint the leak's location. By following this structured approach, you can effectively diagnose and address any oil leak issues in your vehicle, ensuring it remains in optimal condition.

What are the common causes of oil leaks in a 2021 Mercedes-Benz GLC63 AMG S?

When dealing with oil leaks in a 2021 Mercedes-Benz GLC63 AMG S, it's essential to understand the common culprits that may be at play. One of the primary issues is the degradation of gaskets and seals, which can occur over time due to heat and wear, leading to leaks around critical engine components. Additionally, a loose or improperly installed oil filter can be a significant source of leaks; ensuring that the filter is correctly tightened and the right size is crucial for preventing oil from escaping. Another area to inspect is the oil pan, which can suffer from corrosion or physical damage, resulting in cracks or holes that allow oil to seep out. The oil drain plug is also a potential problem; if it is loose or damaged, it can lead to oil leaking from the pan. Lastly, keep an eye on the engine components themselves, as cracks in the engine block or other parts can also contribute to oil leaks. Addressing these issues promptly is vital to maintaining engine health and performance, and regular inspections can help catch these problems early, allowing for effective DIY repairs.

How urgent is it to address the oil leak in my 2021 Mercedes-Benz GLC63 AMG S?

Addressing an oil leak in your 2021 Mercedes-Benz GLC63 AMG S is not just a matter of routine maintenance; it is an urgent issue that requires immediate attention. Oil leaks can severely compromise the lubrication of essential engine components, leading to overheating and potentially catastrophic engine damage. Furthermore, neglecting this problem can escalate into more significant issues, such as engine failure or damage to other vehicle parts, which can be both costly and time-consuming to repair. Beyond mechanical concerns, oil leaks pose safety risks by creating slippery road conditions, endangering not only your safety but also that of other drivers. By addressing the leak promptly, you can mitigate these risks and avoid incurring expensive repairs down the line. Therefore, if you notice any signs of an oil leak, it is crucial to inspect and repair the issue as soon as possible, ideally with the assistance of a qualified mechanic, to ensure the continued performance and safety of your vehicle.

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2021 Mercedes-Benz GLC63 AMG S Oil Leak Causes & Repairs