2018 Mercedes-Benz CLS63 AMG S Is Leaking Oil

Diagnosing Oil Leak Sources in Your 2018 Mercedes-Benz CLS63 AMG S and Recommended Repair Solutions

Find Repair Location
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 2018 Mercedes-Benz CLS63 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 CLS63 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.

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 an oil leak in a 2018 Mercedes-Benz CLS63 AMG S?

To effectively diagnose an oil leak in a 2018 Mercedes-Benz CLS63 AMG S, begin with a thorough visual inspection of the engine and undercarriage, looking for any obvious signs of oil accumulation or stains. Next, check the oil levels to determine if there has been a significant drop, which could indicate a leak. Pay close attention to the oil filter and drain plug, as these components are common sources of leaks; ensure they are secure and free from oil residue. Additionally, examine the gaskets and seals for any signs of wear or damage, as these can also lead to leaks. If the source remains elusive, consider performing a pressure test on the oil system to identify hidden leaks. For a more precise diagnosis, adding UV dye to the engine oil can help pinpoint the leak's location when illuminated with a UV light. If these steps do not yield results or if the situation appears complex, seeking assistance from a qualified mechanic is recommended to ensure proper diagnosis and repair.

What are the common causes of oil leaks in a 2018 Mercedes-Benz CLS63 AMG S?

When dealing with oil leaks in a 2018 Mercedes-Benz CLS63 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, leading to leaks. Similarly, valve cover gaskets are prone to deterioration, and their failure can result in oil escaping from the engine. Another area to inspect is the oil filter housing gasket; if this component fails, it can create leaks around the oil filter. Additionally, the seals surrounding the oil cooler can degrade, causing oil to leak in that area. Lastly, the rear main seal is another potential source of leaks, as it can wear out and allow oil to escape from the back of the engine. Addressing these issues promptly is essential to maintain the vehicle's performance and prevent further damage, making regular inspections and maintenance vital for any DIY enthusiast.

How urgent is it to address the oil leak in my 2018 Mercedes-Benz CLS63 AMG S?

Addressing an oil leak in your 2018 Mercedes-Benz CLS63 AMG S is not just a matter of convenience; it is a critical issue that requires immediate attention. Ignoring an oil leak can lead to severe engine damage due to inadequate lubrication, which may result in overheating and costly repairs. Additionally, the environmental impact of leaking oil cannot be overlooked, as it poses a risk to local ecosystems if it seeps into the ground or waterways. Financially, the longer you wait to fix the leak, the more extensive the damage can become, leading to higher repair costs down the line. Therefore, it is essential to act swiftly to maintain your vehicle's performance, protect the environment, and avoid unnecessary expenses. Taking prompt action not only safeguards your engine but also ensures that your CLS63 AMG S remains in optimal condition for years to come.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.