2017 BMW 640i XDrive Is Leaking Oil

Identifying the Causes of Oil Leaks in Your 2017 BMW 640i xDrive 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 2017 BMW 640i xDrive 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 2017 BMW 640i xDrive 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 2017 BMW 640i xDrive?

When diagnosing an oil leak in your 2017 BMW 640i xDrive, it's essential to adopt a systematic approach that begins with the most straightforward checks. Start by visually inspecting the area beneath your vehicle for any signs of oil pooling or dripping, as this can provide immediate clues about the leak's location. Next, check the oil level using the dipstick; a significantly low level may indicate a leak that needs addressing. Pay close attention to the oil filter and drain plug, ensuring they are secure and free from damage, as these are common culprits for leaks. Additionally, examine the gaskets and seals around the engine, particularly the valve cover and oil pan gaskets, since these areas are prone to wear and leakage over time. If the source remains elusive, consider using UV dye in the oil, which can help illuminate the leak under a UV light after running the engine. For a more thorough investigation, a pressure test of the oil system can pinpoint leaks that are not immediately visible. If these methods do not yield results or if you feel uncertain about the process, consulting a professional mechanic is advisable, as they possess the expertise and specialized tools necessary for accurate diagnosis and repair.

What are the common causes of oil leaks in a 2017 BMW 640i xDrive?

When dealing with oil leaks in a 2017 BMW 640i xDrive, it's essential to understand the common culprits that may be at play. One of the primary causes is the degradation of gaskets and seals, such as the valve cover gasket or oil pan gasket, which can wear out over time and lead to leaks. Additionally, the oil filter housing gasket is another frequent offender, as it can deteriorate and allow oil to escape. A faulty oil cooler may also contribute to leaks, particularly if it has developed cracks or other issues. Furthermore, inspect the oil pan for any signs of damage, as road debris or corrosion can create cracks that result in oil loss. Lastly, ensure that the oil drain plug is secure and undamaged, as a loose or faulty plug can easily lead to leaks. By regularly checking these components and addressing any wear or damage, DIY enthusiasts can effectively manage and prevent oil leaks in their BMW 640i xDrive.

How urgent is it to address the oil leak in my 2017 BMW 640i xDrive?

When dealing with an oil leak in your 2017 BMW 640i xDrive, understanding the urgency of the situation is crucial for maintaining your vehicle's performance and safety. A minor leak may seem manageable, but even small issues can escalate quickly, leading to significant engine damage if left unaddressed. The loss of lubrication from an oil leak can cause critical engine components to wear prematurely, resulting in costly repairs that could have been avoided with timely intervention. Moreover, oil leaks pose safety risks, particularly if the oil comes into contact with hot engine parts, creating a fire hazard. Addressing the leak promptly not only protects your vehicle but also ensures your safety on the road. Additionally, consider the environmental implications; oil leaks can contaminate soil and water sources, making it essential to fix the issue quickly to minimize harm. In summary, while the severity of the leak dictates the urgency, it is generally advisable to act swiftly to prevent further damage, ensure safety, and protect the environment.

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2017 BMW 640i xDrive Oil Leak Diagnosis & Repair | RepairPal