2018 Audi S7 Is Leaking Oil

Discovering the Causes of Oil Leaks in Your 2018 Audi S7 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 S7 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 S7 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 steps to diagnose the oil leak in a 2018 Audi S7?

To effectively diagnose an oil leak in your 2018 Audi S7, begin with a thorough visual inspection of the engine and undercarriage, looking for any obvious signs of oil, such as puddles or stains. 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 are common areas where leaks can occur; ensure they are secure and free from oil residue. Additionally, inspect the gaskets and seals for any signs of wear or damage, as these components are critical in preventing leaks. If the source remains elusive, consider performing a pressure test on the oil system to uncover hidden leaks. For a more precise diagnosis, adding UV dye to the engine oil can help you pinpoint the leak's location when illuminated with a UV light. If these steps do not yield results or if the situation appears complex, consulting a professional mechanic with expertise in Audi vehicles is advisable for a comprehensive evaluation and repair. By following this diagnostic approach, you can systematically identify and address the oil leak issue in your vehicle.

What are the common causes of oil leaks in a 2018 Audi S7?

When dealing with oil leaks in a 2018 Audi S7, it's essential 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 and lead to leaks. Additionally, valve cover gaskets are prone to deterioration, often resulting in oil seeping from the top of the engine. Another area to inspect is the oil filter housing; a faulty gasket here can cause oil to leak around the filter. The oil cooler seals are also susceptible to wear, which can lead to leaks in that region. Lastly, the rear main seal, located at the back of the engine, can develop leaks that may result in noticeable oil seepage. Addressing these issues promptly is crucial to prevent further engine damage and ensure your Audi S7 continues to perform optimally. Regular maintenance and thorough inspections can help you catch these problems early, allowing for effective DIY repairs.

How urgent is it to address the oil leak in my 2018 Audi S7?

Addressing an oil leak in your 2018 Audi S7 is not just a matter of routine maintenance; it is a pressing concern that requires immediate attention. An oil leak can significantly reduce oil levels, leading to inadequate lubrication of the engine, which may result in severe engine damage over time. Furthermore, neglecting this issue can escalate into more serious problems, such as engine overheating or even catastrophic engine failure, which can be both costly and dangerous. The safety implications are also considerable, as leaking oil can drip onto hot engine components, creating 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 hazards. Therefore, it is crucial to act swiftly to mitigate these risks and ensure the continued health of your Audi S7.

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