2012 Mercedes-Benz E350 Is Leaking Oil

Addressing Oil Leaks in 2012 Mercedes-Benz E350

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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 2012 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 2012 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 2012 Mercedes-Benz E350?

To effectively diagnose an oil leak in your 2012 Mercedes-Benz E350, start by visually inspecting the engine bay and the area beneath the vehicle for any signs of oil stains or puddles, which can help you locate the source of the leak. Next, check the oil level using the dipstick; a significant drop may indicate a leak that needs immediate attention. Focus on common leak points such as gaskets and seals, including the valve cover gasket and oil pan gasket, as these are often culprits. Don’t overlook the oil filter; inspect it for any signs of damage or leakage, as a faulty filter can contribute to oil loss. If the source remains elusive, consider performing a pressure test to identify the leak's exact location by pressurizing the oil system. Should these steps not yield results, consulting a qualified mechanic is advisable for a professional diagnosis and repair, ensuring your vehicle remains in optimal condition.

What are the common causes of oil leaks in a 2012 Mercedes-Benz E350?

When dealing with oil leaks in a 2012 Mercedes-Benz E350, it's crucial to understand the common culprits that may be causing the problem. One frequent issue is the valve cover gasket, which can wear out over time, leading to oil seepage. Another potential source of leaks is the oil filter housing gasket; if this gasket deteriorates, it can allow oil to escape. Additionally, the oil pan gasket is prone to aging and can develop leaks, resulting in oil pooling beneath the engine. The oil cooler seals are also susceptible to degradation, which may manifest as oil leaks near the cooler itself. Lastly, the rear main seal, located at the back of the engine, can fail over time, causing oil to leak from the rear. Addressing these leaks promptly is essential to prevent further engine damage, and regular inspections can help catch these issues early, ensuring your vehicle remains in optimal condition.

How urgent is it to address the oil leak in my 2012 Mercedes-Benz E350?

Addressing an oil leak in your 2012 Mercedes-Benz E350 is not just a matter of routine maintenance; it is an urgent issue that requires immediate attention. Ignoring an oil leak can lead to a significant drop in oil levels, which compromises the lubrication of essential engine components, increasing the risk of severe damage over time. Furthermore, a leaking oil system can cause the engine to overheat, potentially resulting in costly repairs or even complete engine failure. The safety implications are equally concerning, as oil dripping onto hot engine parts can create a fire hazard. By promptly addressing the oil leak, you not only safeguard your vehicle's performance and longevity but also protect yourself and others on the road from potential dangers. Therefore, it is crucial to take action as soon as you notice any signs of an oil leak to ensure the health and safety of your vehicle.

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2012 Mercedes-Benz E350 Leaking Oil: Causes & Repair Options