2015 Mercedes-Benz S550 Is Leaking Oil

Address Oil Leaks in Your 2015 Mercedes-Benz S550 Effectively

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Reviewed by
Devin Cabugcal
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 2015 Mercedes-Benz S550 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 2015 Mercedes-Benz S550 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.

An oil leak may be noted on the ground where the vehicle is parked. However, many vehicles have plastic trays underneath the engine that may catch leaking oil and conceal the leak. In such cases, a low oil level, a burning oil smell, or even smoke from oil burning in the engine bay may be noted.

»MORE: Signs of a bad oil pan gasket

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 2015 Mercedes-Benz S550?

When diagnosing an oil leak in a 2015 Mercedes-Benz S550, it's essential to adopt a systematic approach that begins with simple visual inspections and progresses to more complex diagnostic methods. Start by conducting a thorough visual inspection of the engine bay, under the vehicle, and the parking area for any visible signs of oil, such as puddles or drips. 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 sources of leaks; ensure they are secure and free from oil residue. Additionally, inspect the gaskets and seals for any signs of wear or damage that could lead to leaks. If the source remains elusive, consider performing a pressure test to pinpoint the leak's location by pressurizing the oil system. For more hidden leaks, adding UV dye to the oil can help; after running the engine, use a UV light to reveal any leaks that may not be visible otherwise. If these steps do not yield results, consulting a qualified mechanic is advisable for a more in-depth inspection and repair. This methodical approach not only helps in accurately diagnosing the issue but also ensures that you address the problem efficiently and effectively.

What are the common causes of oil leaks in a 2015 Mercedes-Benz S550?

When dealing with oil leaks in a 2015 Mercedes-Benz S550, it's crucial to understand the common culprits that may be at play. One of the primary issues is the degradation of the oil pan gasket, which can wear down over time, leading to leaks at the bottom of the engine. Additionally, worn valve cover gaskets are another frequent source of oil seepage, often noticeable from the top of the engine. It's also important to check the oil filter housing gasket, as a faulty seal in this area can result in oil leaking around the oil filter. Furthermore, oil cooler lines can develop leaks due to age and wear, contributing to oil loss. Lastly, various oil seals, including crankshaft and camshaft seals, can deteriorate, leading to leaks that may not be immediately visible. 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 2015 Mercedes-Benz S550?

Addressing an oil leak in your 2015 Mercedes-Benz S550 is not just a matter of routine maintenance; it is a pressing issue that requires immediate attention. An oil leak can lead to a significant loss of engine oil, which is essential for lubricating moving parts. Without adequate lubrication, the engine can suffer from increased friction, leading to severe damage over time. Additionally, neglecting an oil leak can compromise your vehicle's performance, resulting in decreased fuel efficiency and increased operational costs. The safety implications are equally concerning, as oil can drip onto hot engine components, creating a fire hazard. Furthermore, postponing repairs can escalate the problem, potentially leading to extensive and costly damage to the engine or transmission. Therefore, it is crucial to act swiftly to address any oil leaks to ensure the longevity, performance, and safety of your Mercedes-Benz S550.

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2015 Mercedes-Benz S550 Oil Leak Causes & Repair Costs