2018 Buick Enclave Is Leaking Oil

Discovering the Causes of Oil Leaks in Your 2018 Buick Enclave 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 Buick Enclave 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 Buick Enclave 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.

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 initial diagnostic steps to identify the source of the oil leak in a 2018 Buick Enclave?

When tackling an oil leak in your 2018 Buick Enclave, start by locating the leak, which involves inspecting the underside of the vehicle for any visible oil spots or drips. This initial step is crucial as it helps you determine the general area of the leak. Next, check the oil level in the engine to ensure it is not critically low, as this could indicate a more severe issue. After confirming the oil level, examine the oil filter and drain plug for any signs of leakage or looseness, as these components are often the culprits behind oil leaks. Additionally, inspect the gaskets and seals, particularly the valve cover gasket and oil pan gasket, since these areas are common sources of leaks. Don’t forget to check the oil pressure sensor, as it can also leak oil if faulty. Lastly, take a look at the Positive Crankcase Ventilation (PCV) system for any blockages or leaks. If the source remains elusive, consider performing a UV dye test, which can help you trace the leak more effectively. By following these steps, you can systematically diagnose the oil leak and take the necessary actions to resolve it.

What are the common causes of oil leaks in a 2018 Buick Enclave?

When dealing with oil leaks in a 2018 Buick Enclave, it's essential to understand the common culprits that may be at play. One frequent issue is a worn or damaged oil pan gasket, which can deteriorate over time and lead to significant leaks. Similarly, a faulty valve cover gasket can cause oil seepage, making it crucial to inspect this area for any signs of wear. Another potential source of leaks is the oil filter; if it is loose or damaged, it can allow oil to escape from the engine. Additionally, cracked or worn seals around engine components, such as the crankshaft or camshaft seals, can also contribute to oil leaks. Lastly, overfilling the engine with oil can create excessive pressure on seals and gaskets, resulting in leaks. Addressing these issues promptly is vital to prevent further engine damage and ensure optimal vehicle performance. Regular maintenance and thorough inspections can help you catch these problems early, allowing for effective DIY repairs.

How urgent is it to address an oil leak in a 2018 Buick Enclave?

Addressing an oil leak in a 2018 Buick Enclave is of utmost importance and should not be delayed. The urgency stems from the fact that oil leaks can lead to a significant loss of engine lubrication, which is essential for preventing overheating and protecting engine components from damage. If left unattended, the leak can escalate into more severe issues, resulting in costly repairs or even complete engine failure. Additionally, oil leaks pose safety risks; oil can drip onto hot engine parts, creating a fire hazard that endangers both the vehicle and its occupants. Therefore, it is crucial for DIY enthusiasts to act swiftly when they notice signs of an oil leak, ensuring the vehicle remains safe and operational while avoiding further damage.

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