2018 Toyota Avalon Is Leaking Oil

Identifying the Causes of Oil Leaks in Your 2018 Toyota Avalon 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 Toyota Avalon 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 Toyota Avalon 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 an oil leak in a 2018 Toyota Avalon?

To effectively diagnose an oil leak in your 2018 Toyota Avalon, begin by visually inspecting the area beneath your vehicle for any oil spots, which can help pinpoint the leak's location. Next, check the oil level using the dipstick; a significant drop may indicate a leak that needs addressing. Pay close attention to the oil filter and drain plug, as these components are common culprits for leaks—ensure they are secure and free from oil residue. Additionally, examine the gaskets and seals around the engine for signs of wear or damage, as these can also lead to leaks. If the source remains elusive, consider adding UV dye to the engine oil and running the engine; this will allow you to use a UV light to identify the leak more easily. For a thorough assessment, performing a pressure test on the oil system can reveal hidden leaks. If these steps do not yield results, consulting a mechanic may be necessary for a professional evaluation and repair. This structured approach not only simplifies the diagnostic process but also empowers you to tackle the issue effectively.

What are the common causes of oil leaks in a 2018 Toyota Avalon?

When diagnosing oil leaks in a 2018 Toyota Avalon, it's essential to understand the common problems that may arise. One frequent culprit is a degraded or damaged oil pan gasket, which can wear out over time and lead to leaks. Additionally, a worn valve cover gasket can allow oil to escape from the top of the engine, creating noticeable drips. Another area to inspect is the oil filter and its gasket; if either is not properly sealed, it can result in leaks. Furthermore, a damaged or improperly tightened oil drain plug can also be a source of oil leakage from the oil pan. Lastly, keep an eye on the seals around various engine components, such as the crankshaft and camshaft, as these can crack or wear out, leading to oil leaks. Regular maintenance and thorough inspections of these components can help prevent oil leaks and maintain the performance of your Avalon.

How urgent is it to address the oil leak in my 2018 Toyota Avalon?

Addressing an oil leak in your 2018 Toyota Avalon 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 engine wear and tear, ultimately resulting in costly repairs or even complete engine failure. Moreover, neglecting an oil leak can lead to overheating, as the engine struggles to maintain optimal temperatures without sufficient oil. This overheating not only risks damaging the engine but also poses a serious safety hazard, as leaking oil can drip onto hot engine parts, increasing the risk of a fire. 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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