2015 Mercedes-Benz CLA45 AMG Is Leaking Oil

Discovering the Causes of Oil Leaks in Your 2015 Mercedes-Benz CLA45 AMG and How to Address Them

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Reviewed by
Andrew Hajjar
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 2015 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 2015 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 2015 Mercedes-Benz CLA45 AMG?

To diagnose an oil leak in your 2015 Mercedes-Benz CLA45 AMG, begin by thoroughly inspecting the area beneath your vehicle for any visible oil drips or pooling, as this can provide immediate clues about the leak's location. Next, check the oil level in the engine; a consistently low level may indicate a leak that needs attention. Focus on common leak points such as gaskets and seals, including the valve cover gasket and oil pan gasket, as these are frequent culprits. Don’t overlook the oil filter; inspect it for any signs of damage or leakage, as a faulty filter can contribute to oil loss. Additionally, ensure that the drain plug is secure and not the source of the leak, and if your vehicle has an oil cooler, examine it for any signs of wear or leaks. If these steps do not reveal the source of the leak, or if the problem appears to be more complex, it may be wise to consult a qualified mechanic for a professional assessment. By following this structured diagnostic approach, you can effectively identify and address oil leaks in your vehicle, ensuring it remains in optimal condition.

What are the common causes of oil leaks in a 2015 Mercedes-Benz CLA45 AMG?

When diagnosing oil leaks in a 2015 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 oil pan gasket, which can wear out over time, leading to leaks that can be easily spotted under the vehicle. Another common source is the valve cover gasket, which may deteriorate and allow oil to escape, often resulting in visible oil pooling around the engine. Additionally, the oil filter housing gasket can fail, causing leaks in the engine compartment that may be mistaken for other issues. The seals around the oil cooler are also prone to degradation, contributing to leaks in that area. Lastly, the timing cover can develop leaks due to damaged gaskets or seals, leading to oil seepage that can affect engine performance. By regularly inspecting these components and addressing any signs of wear or damage, DIY enthusiasts can effectively manage oil leaks and maintain the performance of their CLA45 AMG.

How urgent is it to address the oil leak in my 2015 Mercedes-Benz CLA45 AMG?

Addressing an oil leak in your 2015 Mercedes-Benz CLA45 AMG is not just a matter of routine maintenance; it is a critical issue that demands immediate attention. Ignoring an oil leak can lead to a significant drop in oil levels, which may result in severe engine damage over time. The engine relies on oil for lubrication, and without it, the components can wear down quickly, leading to costly repairs that could have been easily avoided. Moreover, an oil leak can compromise your vehicle's performance, causing it to run less efficiently and potentially affecting your driving experience. Safety is another crucial factor; oil spills can create hazardous conditions on the road, increasing the risk of accidents for you and other drivers. By addressing the leak promptly, you not only protect your investment but also ensure the safety of yourself and others. Therefore, it is imperative to take action as soon as you notice any signs of an oil leak in your CLA45 AMG to prevent further complications and maintain optimal vehicle performance.

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2015 Mercedes-Benz CLA45 AMG Oil Leak Causes & Solutions