2018 Nissan Altima Is Leaking Oil

Identifying the Causes of Oil Leaks in Your 2018 Nissan Altima 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 Nissan Altima 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 Nissan Altima 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 steps should I take to diagnose the oil leak in my 2018 Nissan Altima?

To effectively diagnose an oil leak in your 2018 Nissan Altima, begin with a systematic approach that prioritizes simplicity before delving into more complex diagnostics. Start by locating the leak; inspect the area beneath your vehicle for any visible oil drips or pooling, and check for oil stains on the engine and surrounding components. Next, verify the oil level in your engine, as consistently low levels may indicate a leak. Focus on the oil filter and drain plug, ensuring they are secure and free from damage. Examine gaskets and seals, particularly the valve cover gasket and oil pan gasket, for signs of wear. If the source remains elusive, consider adding UV dye to the oil, which can help highlight leaks when viewed under a UV light. For a more thorough investigation, a pressure test of the oil system can pinpoint leaks in lines or fittings. If these steps do not yield results, consulting a qualified mechanic is advisable for a professional assessment. By following this structured diagnostic 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 Nissan Altima?

When dealing with oil leaks in a 2018 Nissan Altima, 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 deteriorate over time, leading to leaks. Additionally, a faulty or improperly installed oil filter can also result in oil seeping out, so checking the filter's condition and installation is essential. Another area to inspect is the valve cover gasket, as wear and tear can cause it to leak, allowing oil to escape. Don't overlook the oil drain plug; if it's loose or damaged, it can be a significant source of leaks. Lastly, a leak from the rear main seal can be a more serious concern, as it often indicates a more extensive issue. Addressing these problems promptly is vital to maintaining your vehicle's performance and preventing potential engine damage. Regular inspections and maintenance can help you catch these issues early, ensuring your Altima runs smoothly.

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

Addressing an oil leak in your 2018 Nissan Altima is of utmost importance to prevent serious engine damage. Oil plays a vital role in lubricating engine components, and a leak can lead to insufficient lubrication, resulting in increased friction and wear on critical parts. If left unchecked, the oil levels can drop dangerously low, leading to overheating and further deterioration of the engine. Moreover, continuous driving with an oil leak can contaminate other systems, such as the cooling system, compounding the risk of damage. Ignoring this issue not only risks engine failure but can also lead to costly repairs or even a complete engine replacement. Therefore, it is essential to address any signs of an oil leak immediately to safeguard your vehicle's performance and longevity.

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2018 Nissan Altima Oil Leak Solutions & Repair Costs