Lexus GS350 Is Leaking Oil

Discover the Common Causes of Oil Leaks in Your Lexus GS350 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 Lexus GS350 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 Lexus GS350 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

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.

Troubleshooting Oil Leaks in a Lexus GS350

When troubleshooting oil leaks in your Lexus GS350, start by visually inspecting the engine and the area beneath your vehicle for any signs of oil accumulation. Common sources of leaks include the oil pan, oil filter, and various engine gaskets, so pay close attention to these components. If you notice oil spots on the ground, trace them back to their origin, checking the oil drain plug and the oil filter gasket for proper installation and tightness. A degreaser can help clean the engine bay, making it easier to spot fresh leaks. If the leak persists, consider adding an oil leak stopper to the oil fill hole as a temporary measure while you assess the situation. If you suspect that the leak is due to worn gaskets or seals, replacing these components may be necessary to prevent further oil loss. Should your efforts not yield results, or if the leak appears to be significant, seeking professional assistance is advisable to ensure a thorough diagnosis and repair. By following this methodical approach, you can effectively manage oil leaks and maintain the health of your Lexus GS350.

How to Diagnose and Fix Oil Leaks in a Lexus GS350?

When dealing with oil leaks in a Lexus GS350, it's essential to understand the common problems that can arise. One frequent issue is the deterioration of oil cooler pipes, which can lead to leaks if not properly maintained. Additionally, worn-out seals and gaskets can also contribute to oil seepage, particularly around the oil pan and valve covers. Drivers may notice symptoms such as a burning oil smell or visible oil spots on the ground, which are clear indicators of a leak. It's crucial to differentiate between oil and other fluids, as misidentifying the source can lead to unnecessary repairs. Regularly checking fluid levels and being vigilant for any signs of leakage can help catch these problems early, preventing more significant engine damage down the line. By understanding these common failure modes, DIYers can take proactive steps to maintain their vehicle and ensure its longevity.

How to Address an Oil Leak in a Lexus GS350?

Addressing an oil leak in your Lexus GS350 is crucial not only for the longevity of your vehicle but also for your safety on the road. Ignoring the symptoms of an oil leak can lead to significant engine damage, as low oil levels can cause increased friction and overheating. It's essential to regularly check your oil levels and top them up as needed, especially if you notice any signs of leakage. If you suspect an oil leak, start by confirming that the fluid is indeed oil, as other fluids can mimic its appearance. For minor leaks, consider using an oil leak stopper, which can be a cost-effective DIY solution. However, if the leak persists, it’s vital to seek a professional inspection to identify the source, which may involve failing components or gaskets. Remember, driving cautiously and monitoring your vehicle's oil levels can prevent potential leaks and ensure a safer driving experience. Taking prompt action can save you from costly repairs and keep your Lexus GS350 running smoothly.

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