2009 Mercedes-Benz S65 AMG Is Leaking Oil

Identifying the Causes of Oil Leaks in Your 2009 Mercedes-Benz S65 AMG and How to Address Them

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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 2009 Mercedes-Benz S65 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 2009 Mercedes-Benz S65 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.

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 2009 Mercedes-Benz S65 AMG?

When diagnosing an oil leak in a 2009 Mercedes-Benz S65 AMG, it's essential to adopt a systematic diagnostic approach that prioritizes simpler checks before moving on to more complex assessments. Begin with a thorough visual inspection of the engine and undercarriage to identify any obvious signs of oil pooling or dripping. This initial step can often reveal the source of the leak without further intervention. Next, check the oil levels to determine 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 around the valve cover, oil pan, and camshaft, as wear or damage in these areas is common. If the leak remains elusive, consider performing a pressure test on the oil system to help pinpoint the issue. For a more advanced method, adding UV dye to the oil can assist in locating leaks when used with a UV light. If these steps do not yield results, consulting a qualified mechanic or a Mercedes-Benz dealership is advisable for a professional diagnosis and repair. By following this structured approach, you can effectively identify and address oil leaks in your vehicle.

What are the common causes of oil leaks in a 2009 Mercedes-Benz S65 AMG?

When dealing with oil leaks in a 2009 Mercedes-Benz S65 AMG, it's essential to understand the common culprits that may be causing the problem. One of the primary sources of leaks is the valve cover gaskets, which can deteriorate over time, leading to oil seepage around the valve covers. Another frequent issue is the oil pan gasket, which may also wear out, resulting in oil leaking from the bottom of the engine. Additionally, the oil filter housing gasket can become faulty, causing oil to leak around the oil filter area. The oil cooler seals are another potential source of leaks, as they can wear out and allow oil to escape from the cooler assembly. Lastly, a failing rear main seal can lead to significant oil leaks at the back of the engine. Addressing these issues promptly is crucial for maintaining the vehicle's performance and preventing further engine damage. Regular inspections and maintenance can help DIY enthusiasts identify these leaks early and take the necessary steps to resolve them.

How urgent is it to address the oil leak in my 2009 Mercedes-Benz S65 AMG?

Addressing an oil leak in your 2009 Mercedes-Benz S65 AMG is not just a matter of routine maintenance; it is a critical issue that demands immediate attention. Ignoring an oil leak can lead to a cascade of problems, starting with a decrease in oil levels that can severely damage your engine over time. Insufficient oil can result in engine failure, which is not only costly to repair but could also necessitate a complete engine replacement. Furthermore, a timely response to the leak ensures that your vehicle maintains optimal performance, allowing you to enjoy the luxury and power that the S65 AMG is known for. Additionally, oil leaks pose safety hazards, as they can create slippery surfaces on the road, increasing the risk of accidents. Therefore, it is essential to prioritize the repair of any oil leaks to safeguard both your vehicle's integrity and your safety on the road.

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2009 Mercedes-Benz S65 AMG Oil Leak Causes & Solutions