2021 Mercedes-Benz E350 Is Leaking Oil

Common Causes of Oil Leaks in Your 2021 Mercedes-Benz E350 and How to Address Them Effectively

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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 2021 Mercedes-Benz E350 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 2021 Mercedes-Benz E350 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 the oil leak in a 2021 Mercedes-Benz E350?

When tackling an oil leak in your 2021 Mercedes-Benz E350, start with a thorough visual inspection of the engine and the area beneath the vehicle. Look for any visible signs of oil, such as puddles or drips, particularly around the oil pan, oil filter, and other engine components. Next, check the oil level to determine if it is abnormally low, which could indicate a significant leak. Pay special attention to the oil filter and drain plug; ensure they are secure and free from leaks, tightening or replacing them if necessary. Gaskets and seals are common culprits for oil leaks, so inspect the valve cover gasket, oil pan gasket, and camshaft seals for any signs of wear or damage. If the source remains elusive, consider performing a pressure test on the oil system to help pinpoint the leak's location. For a more advanced approach, adding UV dye to the engine oil can be effective; after running the engine, use a UV light to reveal the leak, as the dye will glow under the light. By following these steps, you can systematically identify and address the source of the oil leak, ensuring your vehicle remains in optimal condition.

What are the common causes of oil leaks in a 2021 Mercedes-Benz E350?

When dealing with oil leaks in a 2021 Mercedes-Benz E350, 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 down over time, leading to leaks. Additionally, worn valve cover gaskets are another common source of oil leakage; if these gaskets are old or damaged, they can allow oil to escape. Another potential problem is a faulty oil filter housing gasket, which can also contribute to leaks if it becomes worn. Furthermore, oil cooler lines may develop leaks due to general wear and tear, resulting in oil loss. Lastly, damaged oil seals, such as those found around the crankshaft or camshaft, can wear out and lead to leaks. Addressing these issues promptly is essential to maintain engine health and performance, and regular inspections can help catch these problems early, allowing DIY enthusiasts to take action before more significant damage occurs.

How urgent is it to address the oil leak in my 2021 Mercedes-Benz E350?

Addressing an oil leak in your 2021 Mercedes-Benz E350 is not just a matter of routine maintenance; it is a pressing issue that requires immediate attention. An oil leak can significantly reduce oil levels, leading to inadequate lubrication of vital engine components, which may result in severe engine damage over time. Furthermore, neglecting this issue can cause the engine to overheat, potentially leading to catastrophic mechanical failures that could leave you stranded or facing costly repairs. Additionally, the safety risks associated with oil leaks cannot be overlooked; oil dripping onto hot engine parts poses a fire hazard, endangering both the vehicle and its occupants. Therefore, it is crucial to prioritize the repair of any oil leaks to safeguard your vehicle's performance and ensure your safety on the road.

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