2018 Mercedes-Benz GLC63 AMG Is Leaking Oil

Address Oil Leaks in Your 2018 Mercedes-Benz GLC63 AMG Effectively

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Reviewed by
Aisha
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 2018 Mercedes-Benz GLC63 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 2018 Mercedes-Benz GLC63 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.

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 steps to diagnose and fix the oil leak in a 2018 Mercedes-Benz GLC63 AMG?

To effectively diagnose and fix an oil leak in your 2018 Mercedes-Benz GLC63 AMG, begin by inspecting the area beneath the vehicle to identify the source of the leak. Look for oil stains or puddles on the ground, which can provide clues about where the oil is escaping. Next, check the engine's oil level to assess any significant loss, as this can indicate the severity of the leak. If the source remains elusive, consider using a dye specifically designed for tracing oil leaks, which can help pinpoint the problem area. Once you have identified the leak, start with the simplest solutions, such as tightening or replacing the oil drain plug and inspecting the oil filter for leaks. If these do not resolve the issue, examine the oil pan gasket and valve cover gasket, as these are common culprits. Should you find any damaged gaskets or seals, replacing them can often rectify the leak. Additionally, inspect the oil cooler lines and seals on engine components, replacing any that show signs of wear. If the leak originates from the oil pan itself, you may need to consider a replacement. After completing the repairs, ensure to clean the affected area thoroughly to eliminate any residual oil, which will help you confirm that the leak has been successfully fixed. By following this structured approach, you can confidently tackle the oil leak issue in your GLC63 AMG.

What are the common causes of oil leaks in a 2018 Mercedes-Benz GLC63 AMG?

When dealing with oil leaks in a 2018 Mercedes-Benz GLC63 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 occur over time and lead to significant oil loss. Additionally, worn-out valve cover gaskets are another common source of leaks, often manifesting as oil seeping from the top of the engine. It's also important to check the oil filter housing gasket, as a fault here can result in oil leaking around the oil filter area. Furthermore, oil cooler lines may develop leaks due to wear and tear, contributing to oil seepage. Lastly, cracked or damaged oil seals, particularly around the crankshaft or camshaft, can also lead to oil leaks. Addressing these issues promptly is essential to prevent further engine damage and maintain optimal vehicle performance. Regular inspections and maintenance can help you catch these problems early, ensuring your GLC63 AMG runs smoothly.

How urgent is it to address the oil leak in my 2018 Mercedes-Benz GLC63 AMG?

Addressing an oil leak in your 2018 Mercedes-Benz GLC63 AMG is not just a matter of routine maintenance; it is a pressing issue that requires immediate attention. Ignoring an oil leak can lead to severe engine damage due to insufficient lubrication, which is vital for the smooth operation of your vehicle. Additionally, the presence of leaking oil can create hazardous conditions, as it may drip onto hot engine components, increasing the risk of a fire. By delaying repairs, you not only jeopardize the performance of your engine but also expose yourself to potentially costly repairs down the line. Therefore, it is crucial to act swiftly and resolve any oil leaks to maintain the safety and reliability of your vehicle.

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