2021 Mercedes-Benz C63 AMG Is Leaking Oil

Diagnosing Oil Leak Sources in Your 2021 Mercedes-Benz C63 AMG and Recommended Repair Solutions

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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 C63 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 C63 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 potential causes of an oil leak in a 2021 Mercedes-Benz C63 AMG, and how should I diagnose them?

When diagnosing an oil leak in your 2021 Mercedes-Benz C63 AMG, it's essential to adopt a systematic approach that prioritizes simpler solutions first. Begin with a thorough visual inspection of the engine and the area beneath the vehicle to identify any obvious signs of oil accumulation. Pay close attention to common culprits such as worn gaskets, seals, and the oil drain plug, as these are often the source of leaks. Regularly checking your oil levels can also provide insight into whether there is a significant loss of oil, which may indicate a leak. If the source remains elusive, consider using UV dye, which can be added to the oil and traced under UV light, making it easier to pinpoint the leak's origin. Additionally, conducting a pressure test can help identify leaks that are not immediately visible. As you inspect, ensure that the oil filter is properly secured and that the oil cooler lines are intact, as these components can also contribute to oil leaks. By following this diagnostic approach, you can effectively narrow down the potential causes and address the issue with confidence.

What are the common causes of oil leaks in a 2021 Mercedes-Benz C63 AMG?

When diagnosing oil leaks in a 2021 Mercedes-Benz C63 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 wear out over time and lead to leaks. Additionally, faulty valve cover gaskets are another common source; if these gaskets are old or compromised, they may fail to create a proper seal, resulting in oil escaping. Another potential problem is a leaking oil filter housing gasket, which can also wear out and cause oil to leak from this critical area. Furthermore, a cracked or damaged oil cooler can contribute to oil leaks, as can a loose or damaged oil drain plug, which may allow oil to seep from the oil pan. Addressing these issues promptly is essential to maintain the performance and longevity of your vehicle, and regular inspections can help catch these problems early, ensuring your C63 AMG remains in top condition.

How urgent is it to address the oil leak in a 2021 Mercedes-Benz C63 AMG?

Addressing an oil leak in your 2021 Mercedes-Benz C63 AMG 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, which in turn can cause severe engine damage due to inadequate lubrication. Moreover, the safety implications cannot be overlooked; leaking oil can drip onto hot engine parts, creating a fire hazard that endangers both the vehicle and its occupants. Additionally, if you continue to drive with an oil leak, you risk exacerbating the problem, leading to more extensive and costly repairs down the line. Therefore, it is crucial to act swiftly and address any signs of an oil leak to protect your vehicle's performance and ensure your safety on the road.

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