2018 Mercedes-Benz GLA45 AMG Is Leaking Oil

Address Oil Leaks in Your 2018 Mercedes-Benz GLA45 AMG Effectively

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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 2018 Mercedes-Benz GLA45 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 2018 Mercedes-Benz GLA45 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 2018 Mercedes-Benz GLA45 AMG?

To effectively diagnose an oil leak in your 2018 Mercedes-Benz GLA45 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, check the oil level in your engine; a consistently low level may indicate a leak that needs addressing. Pay close attention to the gaskets and seals, particularly the valve cover gasket and oil pan gasket, as these are common culprits for leaks. Additionally, inspect the oil filter for any signs of damage or leakage, as a faulty filter can contribute to the problem. Don’t forget to check the drain plug; ensure it is secure and not the source of the leak. If the leak remains elusive, consider adding UV dye to your engine oil, which can help illuminate the leak under a UV light after running the engine. If these steps do not lead to a resolution, it may be time to consult a professional mechanic for a thorough inspection and diagnosis. By following this structured approach, you can effectively identify and address the oil leak in your vehicle.

What are the common causes of oil leaks in a 2018 Mercedes-Benz GLA45 AMG?

When dealing with oil leaks in a 2018 Mercedes-Benz GLA45 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 occur over time due to the constant exposure to heat and oil, leading to leaks that can compromise engine performance. Additionally, the valve cover gasket is another component that may wear out, especially as the vehicle ages and accumulates mileage, resulting in potential oil seepage. Another area to inspect is the oil filter housing gasket; if this part is faulty, it can lead to leaks within the engine compartment. Furthermore, oil cooler lines are susceptible to wear and can develop leaks, which may cause a drop in oil levels if not addressed promptly. Lastly, keep an eye on the oil seals around the crankshaft and camshaft, as these can crack or become damaged over time, leading to further oil leaks. By being aware of these common issues and conducting regular maintenance checks, DIY enthusiasts can effectively manage and resolve oil leak problems, ensuring the longevity and optimal performance of their vehicle.

How urgent is it to address an oil leak in a 2018 Mercedes-Benz GLA45 AMG?

Addressing an oil leak in your 2018 Mercedes-Benz GLA45 AMG is not just a matter of routine maintenance; it is an urgent necessity that can have serious implications for both your vehicle's performance and your safety. An oil leak can lead to a critical loss of lubrication, which is essential for the engine's smooth operation. Without adequate lubrication, the engine can overheat, resulting in severe damage that may require costly repairs or even complete engine failure. Moreover, the presence of oil on the road can create hazardous driving conditions, increasing the risk of accidents for you and other motorists. Promptly addressing an oil leak not only safeguards your vehicle's functionality but also protects your investment by preserving its resale value. Potential buyers are likely to be wary of unresolved issues, making it crucial to tackle any leaks as soon as they are detected. In summary, the urgency of addressing an oil leak in your GLA45 AMG cannot be overstated; it is essential for maintaining safety, performance, and the long-term value of your vehicle.

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2018 Mercedes-Benz GLA45 AMG Oil Leak Guide | RepairPal