2018 Toyota 4Runner Is Leaking Oil

Discovering the Causes of Oil Leaks in Your 2018 Toyota 4Runner and How to Address 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 Toyota 4Runner 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 4Runner 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 4Runner?

To effectively diagnose an oil leak in your 2018 Toyota 4Runner, start by visually inspecting the area where you typically park for any oil puddles or stains, as this can give you a quick indication of the leak's location. Next, check the oil level using the dipstick; a significant drop may suggest a leak that needs attention. Pay close attention to the oil filter and drain plug, as these are common culprits for leaks; ensure they are securely tightened. Then, examine the gaskets and seals around the engine components, such as the valve cover and oil pan gaskets, for any signs of wear or damage that could be causing the leak. 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 pinpoint the leak's origin. For a more thorough investigation, performing a pressure test on the oil system can help identify leaks that are not visible to the naked eye. By following this structured approach, you can systematically diagnose and address any oil leaks in your vehicle.

What are the common causes of oil leaks in a 2018 Toyota 4Runner?

When dealing with oil leaks in a 2018 Toyota 4Runner, 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 and lead to leaks. Additionally, a faulty or improperly installed oil filter can also result in oil escaping from the engine, making it essential to ensure that the filter is correctly fitted. Another area to inspect is the valve cover gasket, as wear and tear can cause it to fail, leading to oil leaks. Furthermore, pay attention to the oil drain plug; if it is loose or damaged, it can be a significant source of leaks. Lastly, a leak from the rear main seal is another possibility that should not be overlooked. Addressing these issues promptly is vital to maintaining your vehicle's performance and preventing further damage, so regular inspections and maintenance are key to keeping your 4Runner in top shape.

How urgent is it to address the oil leak in my 2018 Toyota 4Runner?

Addressing an oil leak in your 2018 Toyota 4Runner is not just a matter of routine maintenance; it is a critical issue that demands immediate attention. An oil leak can lead to a rapid decrease in oil levels, which compromises the lubrication of essential engine components. This lack of lubrication increases friction and heat, significantly raising the risk of engine damage. Moreover, if left unchecked, the leak can escalate into more severe problems, such as engine overheating or even catastrophic engine failure, which can be both dangerous and costly. Safety is another paramount concern, as leaking oil can drip onto hot engine parts, creating a fire hazard that endangers both the vehicle and its occupants. Financially, delaying repairs can lead to extensive damage that results in much higher repair costs down the line. Therefore, it is crucial to address any signs of an oil leak promptly to maintain the health and performance of your 4Runner, ensure safety, and avoid unnecessary expenses.

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