2014 Mercedes-Benz CLA45 AMG Is Leaking Oil

Identifying the Causes of Oil Leaks in Your 2014 Mercedes-Benz CLA45 AMG and How to Address Them

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Reviewed by
Bo Fader
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 2014 Mercedes-Benz CLA45 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 2014 Mercedes-Benz CLA45 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 2014 Mercedes-Benz CLA45 AMG?

To effectively diagnose an oil leak in your 2014 Mercedes-Benz CLA45 AMG, begin by visually inspecting the area beneath your vehicle for any signs of oil pooling or dripping, as this can help you pinpoint the leak's location. Next, turn your attention to the engine components, specifically 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 serious leak that requires immediate attention. Pay special attention to the oil filter to ensure it is securely installed and free from damage, as a faulty filter can lead to leaks. Similarly, inspect the oil pan and valve cover gasket for any visible signs of wear or oil seepage, as these areas are often prone to leaks. Lastly, ensure that the oil drain plug is tight and in good condition, as a loose or damaged plug can exacerbate the problem. If these steps do not reveal the source of the leak, or if the issue appears to be more complex, it may be wise to consult a professional mechanic for further diagnosis and repair. By following this methodical approach, you can effectively identify and address the oil leak in your vehicle.

What are the common causes of oil leaks in a 2014 Mercedes-Benz CLA45 AMG?

When dealing with oil leaks in a 2014 Mercedes-Benz CLA45 AMG, it's crucial to understand the common culprits that may be at play. One frequent issue is the degradation of the valve cover gaskets, which can lead to noticeable oil seepage around the valve covers. Another potential source of leaks is the oil filter housing gasket, which can wear out over time, resulting in oil escaping from this area. Additionally, the oil pan gasket is prone to deterioration, often causing leaks from the bottom of the engine. It's also important to consider the camshaft and crankshaft seals, as failures in these seals can lead to oil leaks within the engine compartment. Lastly, the seals surrounding the oil cooler can degrade, contributing to oil leakage. Addressing these leaks promptly is essential to prevent further engine damage, and regular maintenance checks can help catch these issues early, ensuring your vehicle remains in optimal condition.

How urgent is it to address the oil leak in my 2014 Mercedes-Benz CLA45 AMG?

Addressing an oil leak in your 2014 Mercedes-Benz CLA45 AMG is not just a matter of routine maintenance; it is an urgent issue that requires immediate attention. Oil leaks can significantly reduce oil levels, leading to inadequate lubrication of engine components, which can cause severe engine damage over time. Moreover, neglecting this issue can result in engine overheating, potentially leading to costly repairs or even complete engine failure. The safety risks associated with oil leaks cannot be overlooked either; leaking oil can drip onto hot engine parts, creating a fire hazard. By promptly addressing the oil leak, you not only safeguard your vehicle's performance and longevity but also ensure a safer driving experience. Therefore, it is crucial to take action as soon as you notice any signs of an oil leak to prevent further damage and maintain the overall health of your Mercedes-Benz.

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