2020 Lexus IS350 Is Leaking Oil

Troubleshooting Oil Leaks in Your 2020 Lexus IS350: Common Causes and Repair Solutions

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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 2020 Lexus IS350 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 2020 Lexus IS350 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.

What are the initial diagnostic steps to identify the source of an oil leak in a 2020 Lexus IS350?

When tackling an oil leak in your 2020 Lexus IS350, start with a thorough visual inspection of the engine and undercarriage. Look for any visible signs of oil, such as puddles or stains, particularly around the oil pan, oil filter, and other engine components. Next, check the oil levels to determine if there has been a significant loss, which could indicate a leak. Pay special attention to the oil filter and drain plug; ensure they are secure and free from leaks, tightening or replacing them as needed. Gaskets and seals are common culprits for oil leaks, so inspect the valve cover gasket, oil pan gasket, and camshaft seals for any signs of wear or damage. If the source remains elusive, consider performing a pressure test on the oil system to help pinpoint the leak's location. For a more advanced approach, adding UV dye to the engine oil can be effective; after running the engine, use a UV light to reveal the leak, as the dye will glow under the light. By following these steps, you can systematically identify and address the source of the oil leak, ensuring your Lexus remains in optimal condition.

What are the common causes of oil leaks in a 2020 Lexus IS350?

Understanding the common causes of oil leaks in a 2020 Lexus IS350 is crucial for any DIY enthusiast looking to maintain their vehicle. One prevalent issue is the degradation of the oil pan gasket, which can wear out over time, leading to leaks. Additionally, valve cover gaskets are known to deteriorate, allowing oil to escape from the top of the engine. Another area to inspect is the oil filter housing gasket; if this component fails, it can result in oil leaking around the oil filter. Furthermore, the rear main seal, located at the back of the engine, is another potential source of leaks, as it can develop issues that cause oil to drip onto the ground. Lastly, oil cooler line leaks are also common in the Lexus IS350 and should be checked during any inspection. By being aware of these potential problems, DIYers can take proactive steps to address oil leaks, ensuring their vehicle runs smoothly and efficiently. Regular maintenance and timely inspections are key to preventing more significant engine damage down the line.

How urgent is it to address the oil leak in my 2020 Lexus IS350?

Addressing an oil leak in your 2020 Lexus IS350 is not just a matter of routine maintenance; it is a pressing issue that requires immediate attention. An oil leak can lead to a significant loss of engine oil, which compromises the lubrication necessary for smooth engine operation. This lack of lubrication can result in increased friction among engine components, leading to premature wear and potential catastrophic engine failure. Moreover, neglecting an oil leak can cause the engine to overheat, which poses a serious risk of mechanical failure and can leave you stranded or facing costly repairs. Additionally, the safety implications cannot be overlooked; leaking oil can drip onto hot engine parts, creating a fire hazard that endangers both you and your vehicle. By addressing the oil leak promptly, you not only safeguard the performance and longevity of your Lexus IS350 but also ensure your safety on the road. Therefore, it is crucial to take action without delay to mitigate these risks and maintain the reliability of your vehicle.

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