2021 Mercedes-Benz CLS450 Is Leaking Oil

Common Causes of Oil Leaks in Your 2021 Mercedes-Benz CLS450 and How to Address Them

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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 2021 Mercedes-Benz CLS450 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 CLS450 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 potential causes and diagnostic steps for an oil leak in a 2021 Mercedes-Benz CLS450?

When addressing an oil leak in a 2021 Mercedes-Benz CLS450, it's crucial to follow a methodical diagnostic approach that begins with the simplest checks before moving on to more complex issues. Start by conducting a thorough visual inspection of the vehicle, looking for any signs of oil accumulation beneath the engine or around key components, as this can often reveal the source of the leak, such as worn gaskets or seals. Regularly monitoring the oil levels is also important; a significant drop can indicate a leak that requires immediate attention. If the issue persists, consider performing a pressure test to accurately locate the leak. Pay close attention to the oil filter and drain plug, as these are common sources of leaks, and ensure they are secure and undamaged. Additionally, inspect the oil pan and cooler lines for any cracks or signs of wear, and verify that the valve cover gasket is intact. By following this structured approach, you can effectively diagnose and resolve the oil leak, helping to maintain the performance and reliability of your CLS450.

What are the common causes of oil leaks in a 2021 Mercedes-Benz CLS450?

When dealing with oil leaks in a 2021 Mercedes-Benz CLS450, it's essential to understand the common culprits that may be at play. One frequent issue is a degraded or damaged oil pan gasket, which can deteriorate over time and lead to leaks. Additionally, worn-out valve cover gaskets can allow oil to escape from the top of the engine, creating visible leaks. Another area to inspect is the oil filter housing gasket; if this component is faulty, it can result in oil leaking around the oil filter. Furthermore, oil cooler lines are prone to developing leaks, which can cause oil to drip beneath the vehicle. Lastly, damaged oil seals, such as those found around the crankshaft or camshaft, can also contribute to oil leaks. Regular maintenance and thorough inspections of these components can help you identify and address potential issues early, ensuring your CLS450 remains in optimal condition.

How urgent is it to address the oil leak in my 2021 Mercedes-Benz CLS450?

Addressing an oil leak in your 2021 Mercedes-Benz CLS450 is not just a matter of routine maintenance; it is a pressing issue that requires immediate attention. Oil leaks can significantly reduce oil levels, leading to inadequate lubrication of the engine, which can cause severe damage over time. If left unchecked, the situation can escalate, resulting in engine overheating or even catastrophic engine failure, both of which can be costly to repair. Moreover, an oil leak poses a safety risk, as oil can drip onto hot engine components, creating a fire hazard. By promptly addressing the oil leak, you not only safeguard your vehicle's performance and longevity but also protect yourself and others on the road from potential dangers. Therefore, it is crucial to act swiftly to resolve any oil leak issues in your CLS450 to maintain its health and ensure your safety.

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