2015 BMW 750Li Is Leaking Oil

Discovering the Causes of Oil Leaks in Your 2015 BMW 750Li 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 BMW 750Li is leaking oil are oil system component failure and leaking engine gaskets.
  • Oil System Components: A failure in oil system components, such as a worn oil pump or clogged oil filter, can lead to 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 BMW 750Li 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 BMW 750Li?

To effectively diagnose an oil leak in your 2015 BMW 750Li, start by identifying the source of the leak, as this is crucial for determining the appropriate repair. Common culprits include the valve cover gasket, timing cover gasket, and oil filter housing, so inspect these areas closely. Regularly checking your oil levels can also provide insight into the severity of the leak; a sudden drop in oil levels may indicate a significant issue. Pay attention to any unusual sounds, such as sizzling or popping, which could suggest oil is leaking onto hot engine components, necessitating immediate action. A thorough visual inspection of the engine compartment for oil puddles or drips can further help pinpoint the leak's origin. If the problem persists or if you're unsure about your findings, consulting a trusted BMW specialist is advisable for a more accurate diagnosis and effective repair. By following this diagnostic approach, you can systematically address the oil leak and ensure your vehicle remains in optimal condition.

What are the common causes of oil leaks in a 2015 BMW 750Li?

When dealing with oil leaks in a 2015 BMW 750Li, it's essential to understand the common problems that can arise within the vehicle's oil system. One of the primary culprits is the failure of oil system components, which can lead to significant leaks if not addressed promptly. Engine gaskets, particularly the valve cover gasket, oil filter housing gasket, oil pan gasket, and main engine seal, are also frequent sources of leaks. These gaskets can deteriorate over time, allowing oil to escape and potentially causing damage to other engine parts. Additionally, specific issues such as leaks from the oil filter housing gasket may create the illusion of oil seeping from the oil pan, complicating the diagnosis. It's crucial to accurately identify the leak's location, as failed seals and gaskets can result in oil dripping into lower areas or burning off during operation. For effective repair, replacing the faulty gasket or seal is typically necessary, ensuring the integrity of the oil system and preventing further leaks.

How urgent is it to address the oil leak in my 2015 BMW 750Li?

Addressing an oil leak in your 2015 BMW 750Li is not just a matter of routine maintenance; it is a pressing concern that requires immediate attention. Ignoring an oil leak can lead to a cascade of problems, including diminished engine performance and the risk of overheating, which could ultimately result in catastrophic engine failure. The longer you allow the leak to persist, the more likely you are to experience severe damage to vital engine components, which can be costly to repair. Additionally, consistently low oil levels can compromise the lubrication necessary for your engine to function optimally, increasing wear and tear. Therefore, it is crucial to act swiftly and address any signs of an oil leak to safeguard your vehicle's performance and longevity. Taking prompt action not only protects your investment but also ensures your safety on the road.

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