2018 Mercedes-Benz CLA250 Is Leaking Oil

Address Oil Leaks in Your 2018 Mercedes-Benz CLA250 Effectively

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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 2018 Mercedes-Benz CLA250 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 CLA250 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 initial diagnostic steps to identify the source of an oil leak in a 2018 Mercedes-Benz CLA250?

When tackling an oil leak in a 2018 Mercedes-Benz CLA250, it's essential to adopt a systematic diagnostic approach that begins with straightforward inspections before progressing to more complex methods. Start with a thorough visual inspection of the engine and undercarriage, looking for any obvious signs of oil accumulation or drips, particularly around the oil pan, oil filter, and other critical components. Next, check the oil level to determine if there has been a significant loss, which could indicate a leak. Pay close attention to the oil filter and drain plug, ensuring they are secure and free from leaks. Inspecting gaskets and seals, such as the valve cover and oil pan gaskets, is crucial, as these are common culprits for oil leaks. If the source remains elusive, consider performing a pressure test on the oil system to identify leaks in the lines or fittings. For a more advanced approach, adding UV dye to the engine oil can help pinpoint the leak's location when illuminated with a UV light. By following these steps, you can effectively diagnose and address the oil leak issue in your vehicle.

What are the common causes of oil leaks in a 2018 Mercedes-Benz CLA250?

When dealing with oil leaks in a 2018 Mercedes-Benz CLA250, it's crucial to understand the common culprits that may be at play. One frequent issue is a degraded or damaged oil pan gasket, which can wear out over time and lead to significant leaks. Additionally, a faulty valve cover gasket is another common source of oil seepage, often resulting from wear and tear. The oil filter housing gasket can also be a problem; if it becomes compromised, it can allow oil to escape. Furthermore, cracked or damaged oil cooler seals can lead to leaks from the cooler itself, while a damaged or improperly tightened oil drain plug can cause oil to leak from the oil pan. Addressing these issues promptly is essential to prevent further engine damage and maintain the vehicle's performance. Regular inspections and maintenance can help you catch these problems early, ensuring your CLA250 runs smoothly.

How urgent is it to address the oil leak in my 2018 Mercedes-Benz CLA250?

Addressing an oil leak in your 2018 Mercedes-Benz CLA250 is not just a matter of routine maintenance; it is a pressing concern that requires immediate attention. Ignoring an oil leak can lead to a significant drop in oil levels, which compromises the engine's lubrication and increases the risk of severe damage over time. Additionally, a leaking oil system can cause the engine to overheat, potentially resulting in costly repairs or even complete engine failure. Beyond mechanical issues, oil leaks can create hazardous conditions, as oil dripping onto hot engine components poses a fire risk. By promptly addressing the oil leak, you not only safeguard your vehicle's performance and longevity but also protect yourself and others from potential safety hazards. Therefore, if you notice any signs of an oil leak, it is crucial to take action without delay to prevent further complications.

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2018 Mercedes-Benz CLA250 Oil Leak Causes & Solutions