2018 BMW X3 Is Leaking Oil

Discovering the Causes of Oil Leaks in Your 2018 BMW X3 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 BMW X3 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 BMW X3 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.

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 2018 BMW X3?

When diagnosing an oil leak in your 2018 BMW X3, it's essential to adopt a systematic approach that prioritizes simpler checks before moving on to more complex diagnostics. Begin by locating the leak; inspect the area under the vehicle for any visible oil drips or pooling, as well as checking for oil stains on the engine and transmission. Next, verify the oil level to determine if it is consistently low, which could indicate a leak. Pay close attention to the oil filter and drain plug, as these components are common culprits for leaks due to looseness or damage. Additionally, examine the gaskets and seals within the engine for any signs of wear or deterioration, as faulty gaskets can lead to significant oil loss. If the source of the leak remains elusive, consider using UV dye, which can help you pinpoint the exact location when illuminated with a UV light. Should these steps not yield results, consulting a professional mechanic is advisable, as they can conduct a thorough inspection and provide expert recommendations for repair. By following this structured diagnostic approach, you can effectively identify and address the oil leak in your BMW X3.

What are the common causes of oil leaks in a 2018 BMW X3?

When diagnosing oil leaks in a 2018 BMW X3, it's crucial to understand the common culprits that may be at play. One of the primary causes is the degradation of gaskets and seals, which can occur over time due to exposure to heat and engine vibrations. This wear can lead to oil seeping out of the engine. Additionally, the oil pan itself may suffer damage from road debris or corrosion, creating a pathway for oil to escape. Another frequent issue is the valve cover gasket, which can wear out and develop leaks, allowing oil to drip onto the engine components below. Furthermore, the oil filter housing gasket can also be a source of leaks, particularly if it has not been properly sealed during an oil change. Lastly, don’t overlook the drain plug seal; a worn or faulty seal can lead to oil leaking from the oil pan, especially after an oil change. By being aware of these common issues, DIYers can take proactive steps to inspect and repair their BMW X3, ensuring optimal engine performance and longevity.

How urgent is it to address the oil leak in my 2018 BMW X3?

Addressing an oil leak in your 2018 BMW X3 is not just a matter of routine maintenance; it is a pressing issue that requires immediate attention. Ignoring an oil leak can lead to a significant drop in oil levels, which compromises the lubrication of essential engine components. This lack of lubrication can result in increased friction, leading to premature wear and tear, and ultimately, severe engine damage. Furthermore, an oil leak can cause the engine to overheat, a situation that can escalate into costly repairs or even complete engine failure if left unchecked. Beyond mechanical concerns, there are safety implications to consider; leaking oil can drip onto hot engine parts, creating a fire hazard that endangers both the vehicle and its occupants. Therefore, it is crucial to address any signs of an oil leak promptly to safeguard your BMW X3's performance and ensure your safety on the road.

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