2014 Mercedes-Benz E350 Is Leaking Oil

Identifying the Causes of Oil Leaks in Your 2014 Mercedes-Benz E350 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 2014 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 2014 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 steps to diagnose the oil leak in a 2014 Mercedes-Benz E350?

To effectively diagnose an oil leak in a 2014 Mercedes-Benz E350, start with a comprehensive visual inspection of the engine and undercarriage, looking for any signs of oil accumulation or dripping. This initial step can often reveal the source of the leak without further intervention. Next, check the oil levels to assess if there has been a significant loss, which may indicate a leak. Pay close attention to the oil filter and drain plug, as these components can sometimes be the culprits; ensure they are secure and free from leaks. Additionally, inspect the gaskets and seals, particularly the valve cover gasket and oil pan gasket, for any signs of wear or damage that could lead to oil escaping. If the source remains elusive, consider conducting a pressure test on the oil system to identify leaks in the oil lines or fittings. For a more precise diagnosis, adding UV dye to the engine oil can help trace the leak when illuminated with a UV light. If these steps do not yield results, it may be time to consult a qualified mechanic for professional assistance. By following this structured diagnostic approach, you can systematically identify and address the oil leak issue in your vehicle.

What are the common causes of oil leaks in a 2014 Mercedes-Benz E350?

When dealing with oil leaks in a 2014 Mercedes-Benz E350, it's essential 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 noticeable oil seepage. Additionally, valve cover gaskets are prone to wear and can result in oil leaking from the top of the engine, creating a mess and potential engine damage if not addressed. Another area to inspect is the oil filter housing gasket; if this component fails, it can cause oil to leak around the oil filter, complicating maintenance tasks. Furthermore, the oil cooler seals can deteriorate, leading to leaks near the oil cooler, while a leaking rear main seal can result in oil escaping from the back of the engine. By being aware of these common issues, DIY enthusiasts can perform regular inspections and maintenance, ensuring that any oil leaks are identified and resolved promptly to maintain the health of their vehicle.

How urgent is it to address the oil leak in my 2014 Mercedes-Benz E350?

Addressing an oil leak in your 2014 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 you and your vehicle. Therefore, it is crucial to prioritize the repair of any oil leaks to safeguard your engine's health and ensure your safety on the road.

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