2018 Mercedes-Benz C63 AMG S Is Leaking Oil

Diagnosing Oil Leak Sources in Your 2018 Mercedes-Benz C63 AMG S and Recommended Repair Solutions

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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 C63 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 2018 Mercedes-Benz C63 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 steps should I take to diagnose the oil leak in my 2018 Mercedes-Benz C63 AMG S?

To effectively diagnose an oil leak in your 2018 Mercedes-Benz C63 AMG S, begin by systematically locating the source of the leak. Start by inspecting the area beneath your vehicle for any visible oil drips or pooling, as this can provide immediate clues. Next, check the oil level in your engine; a significant drop may indicate a leak that needs attention. Focus on common culprits such as gaskets and seals, including the valve cover gasket and oil pan gasket, as these are frequent sources of leaks. Additionally, examine the oil filter for any signs of damage or leakage, as a compromised filter can exacerbate the problem. Don’t overlook the oil drain plug; ensure it is securely tightened to prevent leaks. Lastly, inspect the oil cooler for any signs of wear or loose connections. If these steps do not reveal the source of the leak, or if the issue persists, it may be time to consult a qualified mechanic who can provide a more thorough diagnosis and repair. This structured approach not only simplifies the process but also empowers you to tackle the issue with confidence.

What are the common causes of oil leaks in a 2018 Mercedes-Benz C63 AMG S?

When dealing with oil leaks in a 2018 Mercedes-Benz C63 AMG S, it's crucial to understand the common culprits that may be at play. One frequent issue is the degradation of the oil pan gasket, which can wear out over time and lead to leaks. Additionally, valve cover gaskets are known to deteriorate, allowing oil to escape from the top of the engine, which can be particularly noticeable after a drive. Another area to inspect is the oil filter housing gasket; if this component fails, it can result in oil leaking around the oil filter, creating a mess and potential performance issues. The oil cooler seals are also susceptible to wear, and leaks from this area can often go unnoticed until they become significant. Lastly, the rear main seal, located at the back of the engine, can develop leaks as the vehicle ages, leading to oil seepage that may require immediate attention. By regularly inspecting these components and addressing any signs of wear or leakage, owners can maintain their vehicle's performance and prevent more severe engine damage down the line.

How urgent is it to address the oil leak in a 2018 Mercedes-Benz C63 AMG S?

Addressing an oil leak in a 2018 Mercedes-Benz C63 AMG S is a matter of urgency that should not be overlooked. The severity of the leak plays a crucial role in determining how quickly action should be taken; a minor leak may seem manageable, but even small leaks can escalate into major issues if left unattended. The risk of engine damage is significant, as oil is essential for lubricating engine components and preventing overheating. Ignoring a leak can lead to increased friction and wear, ultimately resulting in costly repairs or even engine failure. Additionally, safety concerns arise when oil drips onto hot engine parts, creating a fire hazard that could endanger both the vehicle and its occupants. Environmental considerations also come into play, as oil leaks can contaminate soil and water, making prompt repairs vital for ecological protection. Finally, from a financial perspective, delaying repairs can lead to more extensive damage and higher costs down the line. Therefore, it is advisable to address any oil leak promptly to safeguard your vehicle's performance, ensure safety, protect the environment, and avoid unnecessary expenses.

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