2018 Audi S8 Is Leaking Oil

Discovering the Causes of Oil Leaks in Your 2018 Audi S8 and How to Address Them Promptly

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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 2018 Audi S8 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 2018 Audi S8 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

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 initial steps to diagnose the oil leak in a 2018 Audi S8?

To effectively diagnose an oil leak in your 2018 Audi S8, start with a thorough visual inspection of both the engine bay and the area beneath the vehicle. Look for any visible signs of oil, such as puddles or drips, and check for oil stains on engine components. Next, verify the oil level using the dipstick; a significant drop may indicate a leak. Pay close attention to the oil filter and drain plug, as these are common sources of leaks; ensure they are tight and free from oil residue. Additionally, inspect the gaskets and seals around the engine, as wear or damage here can lead to leaks. If the source remains elusive, consider conducting a pressure test on the oil system, which can help pinpoint the leak's location. Finally, using a diagnostic tool to scan for error codes related to the oil system can provide further insights into the issue. By following these steps, you can systematically identify and address the oil leak in your Audi S8, making the process manageable and efficient for any DIYer.

What are the common causes of oil leaks in a 2018 Audi S8?

When dealing with oil leaks in a 2018 Audi S8, it's crucial to understand the common culprits that may be at play. One frequent issue is the degradation of the oil pan gasket, which can wear out over time, leading to leaks. Similarly, valve cover gaskets are prone to deterioration, and their failure can result in oil escaping from the engine. Another area to inspect is the oil filter housing; a failing gasket here can cause oil to leak around the filter, creating a mess and potential engine damage. Additionally, issues with the camshaft tensioner gasket can also contribute to oil leaks, as can a worn rear main seal, which is located at the back of the engine. By being aware of these common problems, DIY enthusiasts can take proactive steps to inspect and address oil leaks, ensuring their Audi S8 remains in optimal condition. Regular maintenance and timely repairs are essential to prevent further complications and maintain the vehicle's performance.

How urgent is it to address the oil leak in my 2018 Audi S8?

Addressing an oil leak in your 2018 Audi S8 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 engine lubrication and can result in severe damage to engine components. Furthermore, a leaking oil system can cause the engine to overheat, increasing the risk of a breakdown and potentially leaving you stranded. The safety implications are also considerable, as oil dripping onto hot engine parts can create a fire hazard. By taking prompt action to fix the leak, you not only safeguard your vehicle's performance but also prevent more extensive and costly repairs down the line. Therefore, it is crucial to prioritize this issue to ensure the longevity and reliability of your Audi S8.

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