2020 Mercedes-Benz S450 Is Leaking Oil

Common Causes of Oil Leaks in Your 2020 Mercedes-Benz S450 and How to Address Them

Find Repair Location
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 2020 Mercedes-Benz S450 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 2020 Mercedes-Benz S450 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 potential causes of an oil leak in a 2020 Mercedes-Benz S450, and how should I diagnose the issue?

When diagnosing an oil leak in your 2020 Mercedes-Benz S450, it's essential to adopt a systematic approach that prioritizes simpler checks before delving into more complex issues. Start with a thorough visual inspection of the vehicle, looking for any signs of oil pooling beneath the engine or around critical components. Next, monitor your oil levels regularly; a significant drop can indicate a leak. Pay close attention to the gaskets and seals, as these are common culprits for oil leaks due to wear over time. Ensure that the oil drain plug is securely tightened, as a loose plug can lead to oil seepage. Additionally, inspect the oil filter and its housing for any signs of damage or leaks, as a faulty filter can also contribute to the problem. Don’t overlook the oil pan; check for cracks or other damage that could be causing oil to escape. Lastly, examine the oil cooler lines and the valve cover gasket for any signs of wear or leaks. By following this methodical approach, you can effectively identify the source of the oil leak and take the necessary steps to resolve the issue, ensuring your vehicle remains in optimal condition.

What are the common causes of oil leaks in a 2020 Mercedes-Benz S450?

When dealing with oil leaks in a 2020 Mercedes-Benz S450, it's essential to understand the common culprits that may be at play. One of the primary causes is degraded or damaged gaskets and seals, such as the valve cover gasket or oil pan gasket, which can wear out over time and lead to leaks. Additionally, worn oil filters or drain plugs can also contribute to oil leakage, so it's crucial to inspect these components regularly. Another factor to consider is the oil level; overfilling the engine oil can create excess pressure, resulting in leaks. Furthermore, a cracked or damaged oil pan can be a significant source of oil loss, as can faulty oil cooler lines or connections. By being aware of these potential issues and conducting regular maintenance checks, DIY enthusiasts can effectively manage and resolve oil leaks, ensuring the longevity and performance of their vehicle.

How urgent is it to address the oil leak in my 2020 Mercedes-Benz S450?

Addressing an oil leak in your 2020 Mercedes-Benz S450 is not just a matter of routine maintenance; it is a pressing issue that requires immediate attention. An oil leak can significantly reduce the oil levels in your engine, leading to inadequate lubrication of vital components. This lack of lubrication can cause severe wear and tear, ultimately resulting in costly repairs or even complete engine failure. Moreover, neglecting an oil leak can lead to overheating, as the engine struggles to maintain optimal temperatures without sufficient oil. This overheating not only risks damaging the engine but also poses a serious safety hazard, as leaking oil can drip onto hot engine parts, increasing the risk of fire. Therefore, it is crucial to address any signs of an oil leak promptly to safeguard your vehicle's performance and ensure your safety on the road. Taking swift action can save you from more extensive repairs and protect your investment in your Mercedes-Benz S450.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.