2018 Mercedes-Benz C43 AMG Is Leaking Oil

Address Oil Leaks in Your 2018 Mercedes-Benz C43 AMG Effectively

Find Repair Location
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 C43 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 C43 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.

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 C43 AMG?

To effectively diagnose an oil leak in your 2018 Mercedes-Benz C43 AMG, begin with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Start by locating the leak; inspect the area beneath your vehicle for any visible oil spots or puddles, which can provide initial clues. Next, turn your attention to the engine components, focusing on the oil filter, oil pan, valve cover gasket, and oil drain plug, as these are common culprits for leaks. Checking the oil level is also crucial; a significant drop may indicate a leak that needs immediate attention. Pay special attention to the oil filter to ensure it is securely installed and free from damage, as this is a frequent source of leaks. Additionally, examine the oil pan for any cracks or signs of wear, and inspect the valve cover gasket for deterioration, which can lead to oil seeping out. Finally, ensure that the oil drain plug is tight and undamaged, as a loose or stripped plug can also result in oil loss. By following this methodical approach, you can accurately diagnose the source of the oil leak and take the necessary steps to resolve the issue.

What are the common causes of oil leaks in a 2018 Mercedes-Benz C43 AMG?

When diagnosing oil leaks in a 2018 Mercedes-Benz C43 AMG, it's essential to understand the common culprits that may be at play. One frequent issue is the degradation of valve cover gaskets, which can lead to noticeable oil seepage over time. Additionally, the oil pan gasket is another critical area that can wear out, resulting in leaks from the engine's base. DIY enthusiasts should also check the oil filter housing gasket, as a faulty seal here can cause oil to leak around the filter, creating a mess and potential performance issues. Furthermore, the oil cooler seals are prone to deterioration, which can lead to leaks within the cooling system. Lastly, the rear main seal, located at the back of the engine, is another potential source of leaks, especially if it has failed, allowing oil to escape between the engine and transmission. Addressing these common causes promptly is vital for maintaining the engine's health and ensuring the vehicle operates smoothly.

How urgent is it to address the oil leak in my 2018 Mercedes-Benz C43 AMG?

Addressing an oil leak in your 2018 Mercedes-Benz C43 AMG is not just a matter of routine maintenance; it is a critical step in ensuring the longevity and performance of your vehicle. Ignoring an oil leak can lead to severe engine damage, as the lack of adequate lubrication can cause components to wear out prematurely. Additionally, an oil leak can significantly impact your car's performance, leading to decreased efficiency and power. Safety is another crucial factor; oil on the road can create hazardous driving conditions, increasing the risk of accidents. Furthermore, the environmental implications of oil leaks cannot be overlooked, as they can contaminate soil and water sources. Therefore, it is essential to address any signs of an oil leak immediately, not only to protect your investment but also to ensure your safety and that of others on the road. Taking prompt action will help maintain your vehicle's performance and prevent costly repairs down the line.

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.