2018 Chevrolet Impala Is Leaking Oil

Discovering the Causes of Oil Leaks in Your 2018 Chevrolet Impala and How to Fix Them Effectively

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Reviewed by
Andrew Hajjar
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 Chevrolet Impala 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 Chevrolet Impala 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 steps should I take to diagnose the oil leak in my 2018 Chevrolet Impala?

To effectively diagnose an oil leak in your 2018 Chevrolet Impala, begin with a systematic approach that prioritizes simpler checks before moving on to more complex diagnostics. Start by locating the leak; inspect the area under your vehicle for any visible oil drips or stains, which can provide immediate clues. Next, check the oil level in the engine; a consistently low level may indicate a leak. Focus on the oil filter and drain plug, ensuring they are secure and free from damage, as these are common leak points. Additionally, examine gaskets and seals, particularly the valve cover and oil pan gaskets, for signs of wear. If the source remains elusive, consider using UV dye in the oil, which can help highlight leaks under UV light. For more thorough diagnostics, a pressure test of the oil system can pinpoint leaks in lines or fittings. If these steps do not yield results, consulting a professional mechanic is advisable, as they possess the expertise and tools necessary for a comprehensive diagnosis and repair. By following this structured approach, you can efficiently identify and address the oil leak issue in your vehicle.

What are the common causes of oil leaks in a 2018 Chevrolet Impala?

When diagnosing oil leaks in a 2018 Chevrolet Impala, it's crucial to understand the common culprits that may be at play. One frequent issue is a worn or damaged oil pan gasket, which can lead to oil seepage as it deteriorates over time. Similarly, the valve cover gasket is another area to inspect; if it becomes compromised, it can allow oil to escape from the engine. Additionally, the oil filter housing gasket can fail, resulting in leaks from the housing itself. Lastly, don't overlook the rear main seal, located at the back of the engine, as a potential source of oil leaks if it becomes worn or damaged. Addressing these issues promptly is vital to prevent further engine damage and maintain the vehicle's performance. Regular inspections and maintenance can help you catch these problems early, ensuring your Impala runs smoothly.

How urgent is it to address the oil leak in my 2018 Chevrolet Impala to prevent potential engine damage?

Addressing an oil leak in your 2018 Chevrolet Impala is not just a matter of convenience; it is a critical step in safeguarding your vehicle's engine health. Oil plays a vital role in lubricating engine components, and a leak can lead to dangerously low oil levels, which significantly increases the risk of engine damage. If left unchecked, the friction between moving parts can escalate, resulting in overheating and severe wear that may require costly repairs or even engine replacement. Regularly monitoring your oil levels and promptly addressing any leaks is essential to maintain optimal engine performance and longevity. Ignoring these symptoms can lead to dire consequences, making it imperative to consult a mechanic at the first sign of an oil leak. Taking swift action not only protects your investment but also ensures your vehicle remains safe and reliable on the road.

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2018 Chevrolet Impala Oil Leak Causes & Repairs | RepairPal