2015 BMW 750i Is Leaking Oil

Discovering the Causes of Oil Leaks in Your 2015 BMW 750i and How to Address Them Effectively

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Reviewed by
Aisha
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 750i 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 750i 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 steps to diagnose the oil leak in a 2015 BMW 750i?

To effectively diagnose an oil leak in your 2015 BMW 750i, start by identifying the source of the leak, focusing on common areas such as the valve cover gasket, timing cover gasket, and oil filter housing. Regularly checking your oil levels is essential, as a significant drop can signal a leak. Pay close attention to any unusual engine noises or warning lights on your dashboard, as these can indicate low oil pressure related to a leak. Inspect the top engine components, including turbocharger oil lines, as oil accumulation in this area may suggest a leak from these parts. By systematically assessing these areas, you can pinpoint the issue and take appropriate action to resolve the oil leak effectively.

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

When dealing with oil leaks in a 2015 BMW 750i, it's essential to understand the common culprits that may be at play. One of the primary issues is the failure of oil system components, which can lead to leaks from various points in the engine. As the vehicle ages, engine gaskets and seals naturally deteriorate, making them susceptible to failure. A particularly notorious source of leaks is the valve cover gasket, which surrounds the cylinder head and can wear out over time, allowing oil to escape. Additionally, oil leaks may not always be easy to pinpoint, as the oil can drip down into lower areas of the engine or burn off during operation, complicating the diagnosis. Regular maintenance and thorough inspections are crucial for identifying these issues early, ensuring that any leaks are addressed promptly to prevent further damage to your BMW. By being aware of these common causes, DIY enthusiasts can take proactive steps to maintain their vehicle's integrity and performance.

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

Addressing an oil leak in your 2015 BMW 750i is not just a matter of convenience; it is a critical maintenance task that demands immediate attention. Ignoring even a minor oil leak can lead to severe engine performance issues, including overheating and potential engine failure, which can be costly and inconvenient. The engine relies on oil for lubrication and cooling, and a persistent leak can result in dangerously low oil levels, putting your engine at risk of significant damage. Moreover, the financial implications of delaying repairs can escalate quickly, as minor fixes like a valve cover gasket replacement can turn into much more expensive repairs if the problem worsens. By prioritizing the repair of an oil leak, you not only safeguard your vehicle's performance but also protect your investment from future, more extensive damage. Therefore, if you notice any signs of an oil leak, it is crucial to act swiftly to maintain the health and longevity of your BMW 750i.

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