2018 Audi A5 Quattro Is Leaking Oil

Discovering the Causes of Oil Leaks in Your 2018 Audi A5 Quattro and How to Address Them 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 2018 Audi A5 Quattro 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 A5 Quattro 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 steps should I take to diagnose the oil leak in my 2018 Audi A5 Quattro?

To effectively diagnose an oil leak in your 2018 Audi A5 Quattro, begin with a systematic approach that prioritizes simplicity before delving into more complex assessments. Start by locating the leak; inspect the area beneath your vehicle for any visible oil spots or puddles, which can provide initial clues. Next, turn your attention to the engine itself, examining key components such as the valve cover gasket, oil pan, oil filter, and oil drain plug for any signs of oil accumulation or damage. It’s also crucial to check the oil level in the engine, as a significant drop may indicate a serious leak. Don’t overlook the oil filter, as a faulty one can lead to leaks, and inspect the oil pan for cracks or other damage. If your model includes an oil cooler, ensure it is leak-free, and examine the oil lines and connections for any signs of wear or leakage. If these steps do not reveal the source of the leak, or if the situation appears complicated, seeking assistance from a professional mechanic or an Audi dealership is advisable for a thorough diagnosis and repair. This methodical approach not only helps in identifying the issue but also ensures that you address the problem efficiently and effectively.

What are the common causes of oil leaks in a 2018 Audi A5 Quattro?

When diagnosing oil leaks in a 2018 Audi A5 Quattro, 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 noticeable leaks. Additionally, the valve cover gasket is another area to inspect, as it can deteriorate and allow oil to seep from the top of the engine. The oil filter housing gasket is also a potential source of leaks; if this gasket fails, oil may leak around the oil filter area, creating a mess and potentially leading to more significant issues. Furthermore, the camshaft chain tensioner gasket can develop problems, resulting in leaks if it becomes damaged or worn. Lastly, don't overlook the rear main seal, as leaks from this area can indicate a more serious problem, allowing oil to escape from the back of the engine. Addressing these issues promptly is essential not only for maintaining the performance of your Audi A5 Quattro but also for preventing further damage to the engine. Regular inspections and maintenance can help you catch these leaks early, ensuring a smoother and more reliable driving experience.

How urgent is it to address the oil leak in my 2018 Audi A5 Quattro?

Addressing an oil leak in your 2018 Audi A5 Quattro is not just a matter of routine maintenance; it is an urgent issue that requires immediate attention. Oil leaks 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 engine damage. Furthermore, neglecting an oil leak can lead to overheating, which poses a serious risk of engine failure and expensive repairs. Additionally, the safety implications cannot be overlooked; leaking oil can drip onto hot engine parts, creating a fire hazard that endangers both the vehicle and its occupants. 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.

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