2015 Lexus IS350 Is Leaking Oil

Discovering the Causes of Oil Leaks in Your 2015 Lexus IS350 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 2015 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 2015 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 steps should I take to diagnose the oil leak in my 2015 Lexus IS350?

When diagnosing an oil leak in your 2015 Lexus IS350, it's essential to adopt a systematic approach that begins with the most straightforward methods before progressing to more complex diagnostics. Start by locating the leak; inspect the area beneath your vehicle for any visible oil spots or puddles, which can provide initial clues. Next, conduct a thorough inspection of the engine components, focusing on areas like the oil pan, valve cover gasket, oil filter, and oil drain plug, as these are common leak points. It's also crucial to check the oil level, as a significant drop may indicate a leak. If the source remains elusive, consider adding UV dye to the oil, which can illuminate the leak under UV light, making it easier to trace. For a more precise diagnosis, a pressure test can help identify the exact location of the leak within the oil system. If these steps do not yield results or if the situation appears complicated, seeking the expertise of a professional mechanic is advisable to ensure a thorough and accurate diagnosis. By following this structured approach, you can effectively identify and address the oil leak in your vehicle.

What are the common causes of oil leaks in a 2015 Lexus IS350?

When diagnosing oil leaks in a 2015 Lexus IS350, it's crucial to understand the common culprits that may be at play. One frequent issue is the degradation of the oil pan gasket, which can lead to oil seeping from the bottom of the engine as it ages. Additionally, valve cover gaskets are prone to wear and can result in oil leaking onto the engine block or exhaust manifold, creating potential hazards. Another area to inspect is the oil filter housing gasket; if this component fails, it can cause oil to leak around the oil filter, complicating maintenance tasks. The rear main seal, located at the back of the engine, is also a common source of leaks, as it can deteriorate over time, allowing oil to escape from the rear. Lastly, oil cooler lines can develop leaks, which may lead to oil seepage and a drop in oil pressure. Addressing these issues promptly is essential for maintaining engine health and performance, making regular inspections and maintenance a vital part of vehicle care.

How urgent is it to address the oil leak in a 2015 Lexus IS350?

Addressing an oil leak in your 2015 Lexus IS350 is not just a matter of routine maintenance; it is a pressing concern that demands immediate attention. Ignoring an oil leak can lead to a cascade of problems, starting with a significant drop in oil levels, which compromises engine lubrication. This lack of lubrication can result in severe engine damage over time, potentially leading to costly repairs or even complete engine failure. Moreover, the risk of overheating increases as insufficient oil fails to cool engine components effectively, creating a hazardous situation that could leave you stranded or worse. Additionally, oil leaks pose a safety risk, as oil dripping onto hot engine parts can ignite, leading to a fire. Beyond safety and mechanical integrity, continual oil leaks can diminish your vehicle's performance, resulting in decreased fuel efficiency and higher emissions. Therefore, if you notice any signs of an oil leak, it is crucial to act swiftly to protect your vehicle and ensure its safe operation on the road.

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