2017 Mercedes-Benz CLA45 AMG Is Leaking Oil

Identifying the Causes of Oil Leaks in Your 2017 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 2017 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 2017 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 are the steps to diagnose an oil leak in a 2017 Mercedes-Benz CLA45 AMG?

To effectively diagnose an oil leak in your 2017 Mercedes-Benz CLA45 AMG, begin with a thorough visual inspection of the engine and undercarriage, looking for any obvious signs of oil, such as puddles or stains. Next, check the oil levels to determine if there has been a significant loss, which could indicate a leak. Pay close attention to the oil filter and drain plug, as these components are common culprits for leaks; ensure they are secure and free from oil residue. Additionally, examine the gaskets and seals for any signs of wear or damage, as these can often lead to leaks. If the source remains elusive, consider performing a pressure test on the oil system to uncover hidden leaks. For a more precise diagnosis, adding UV dye to the engine oil can help illuminate the leak's origin under UV light. If these steps do not yield results or if the situation appears complex, seeking assistance from a qualified mechanic is advisable to ensure proper diagnosis and repair.

What are the common causes of oil leaks in a 2017 Mercedes-Benz CLA45 AMG?

When diagnosing oil leaks in a 2017 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 not be immediately noticeable. The seals around the oil cooler are also prone to degradation, contributing to potential leaks. Lastly, issues with the timing cover can lead to oil escaping, which can be more challenging to detect. Addressing these leaks promptly is essential to prevent further engine damage, and regular inspections can help DIY enthusiasts catch these problems early, ensuring their vehicle remains in optimal condition.

How urgent is it to address the oil leak in my 2017 Mercedes-Benz CLA45 AMG?

Addressing an oil leak in your 2017 Mercedes-Benz CLA45 AMG 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 cascade of problems, including decreased oil levels that compromise the lubrication of vital engine components. This lack of lubrication can result in increased friction and heat, ultimately risking severe engine damage. Moreover, maintaining optimal oil levels is essential for the performance and efficiency of your vehicle, ensuring that it runs smoothly and reliably. Beyond mechanical issues, there are safety risks to consider; oil leaking onto hot engine parts can create a fire hazard, putting both you and your vehicle at risk. Additionally, the longer you wait to address the leak, the more likely you are to face costly repairs down the line, as minor issues can escalate into major problems. Therefore, it is crucial to have any oil leak inspected and repaired by a qualified mechanic as soon as possible to safeguard your vehicle's longevity and your safety on the road.

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2017 Mercedes-Benz CLA45 AMG Oil Leak Causes & Solutions