2018 Toyota Sequoia Is Leaking Oil

Discovering the Causes of Oil Leaks in Your 2018 Toyota Sequoia and How to Address Them Effectively

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Reviewed by
Aisha
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 Sequoia 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 Sequoia 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.

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 the oil leak in a 2018 Toyota Sequoia?

To effectively diagnose an oil leak in a 2018 Toyota Sequoia, begin by locating the leak, which involves inspecting the area where you typically park for any oil puddles or stains. This initial step can provide valuable clues about the leak's origin. Next, check the oil level in the engine; a significant drop may indicate a leak that requires attention. Pay close attention to the oil filter and drain plug, as these components are common culprits for leaks—tightening them can sometimes resolve the issue. Additionally, examine the gaskets and seals around the engine, including the valve cover and oil pan gaskets, as wear and tear can lead to leaks. For a more thorough investigation, consider adding UV dye to the engine oil and using a UV light to pinpoint the leak's source, as the dye will illuminate under the light. If the leak remains elusive, performing a pressure test on the oil system can help identify the problem more accurately. Should these methods not yield results, consulting a qualified mechanic is advisable for a comprehensive inspection and repair. By following this diagnostic approach, you can systematically address the issue, starting with simpler checks before moving on to more complex diagnostics.

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

When dealing with oil leaks in a 2018 Toyota Sequoia, it's crucial to understand the common culprits that may be at play. One frequent issue is a degraded or worn-out oil pan gasket, which can deteriorate over time and lead to leaks. Similarly, a faulty valve cover gasket can also cause oil seepage, making it essential to inspect these gaskets regularly. Another potential source of leaks is the oil filter; if it is not installed correctly or is damaged, it can result in significant oil loss. Additionally, physical damage to the oil pan itself can create cracks that allow oil to escape. Lastly, a loose or damaged drain plug can also be a source of leaks, so checking its condition is advisable. Addressing these issues promptly is vital to maintaining engine health and performance, and regular inspections can help catch these problems early, allowing DIY enthusiasts to take action before they escalate.

How urgent is it to address the oil leak in a 2018 Toyota Sequoia?

Addressing an oil leak in a 2018 Toyota Sequoia is not just a matter of routine maintenance; it is an urgent issue that demands immediate attention. Oil leaks can significantly reduce oil levels, leading to inadequate lubrication of engine components, which increases the risk of severe engine damage over time. Furthermore, neglecting an oil leak can result in engine overheating, a situation that could escalate into costly repairs or even complete engine failure. The safety implications are equally concerning, as leaking oil can drip onto hot engine parts, creating a fire hazard. Therefore, it is crucial for vehicle owners to prioritize the repair of any oil leaks to safeguard both the vehicle's performance and the safety of its occupants. Taking prompt action not only helps in avoiding extensive damage but also ensures the longevity and reliability of the vehicle.

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2018 Toyota Sequoia Oil Leak Causes & Diagnosis | RepairPal