2012 BMW 640i Is Leaking Oil

Discovering the Causes of Oil Leaks in Your 2012 BMW 640i and How to Address Them Effectively

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Reviewed by
Devin Cabugcal
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 2012 BMW 640i 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 2012 BMW 640i 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 initial diagnostic steps to take for an oil leak in a 2012 BMW 640i?

When faced with an oil leak in your 2012 BMW 640i, the first step is to identify the source of the leak, as this will guide your subsequent actions. Common culprits include the valve cover gasket, timing cover gasket, and oil filter housing, so a thorough visual inspection of these areas is essential. Regularly checking your oil levels can also provide insight into any sudden drops that may indicate a leak, allowing for timely intervention. Pay particular attention to the valve cover gasket, which can become brittle over time, leading to oil seepage and potential burning smells. Similarly, the oil filter housing gasket is another frequent source of leaks that warrants inspection. If you find the source of the leak but are unsure how to proceed, consulting a trusted independent BMW specialist can be invaluable, as they possess the expertise to diagnose and repair these issues accurately. Additionally, following proper oil change procedures not only helps maintain your engine's health but can also prevent future leaks. By systematically addressing these diagnostic steps, you can effectively manage oil leaks and ensure the longevity of your BMW 640i.

What are the common causes of oil leaks in a 2012 BMW 640i?

When diagnosing oil leaks in a 2012 BMW 640i, it's essential to understand the common problems that can arise from aging engine components. One of the primary culprits is the deterioration of gaskets and seals, particularly the valve cover gasket, oil filter housing gasket, and oil pan gasket. Over time, these components can become brittle and worn, leading to oil seepage that may not be immediately visible. Additionally, as the vehicle ages, the likelihood of failed seals increases, which can result in oil escaping from various points in the engine. This can create a challenging situation for DIY enthusiasts, as the oil may drip into lower areas or burn off during operation, obscuring the source of the leak. Regular maintenance and thorough inspections are crucial for identifying these issues early, as neglecting them can lead to more severe problems, such as engine damage or low oil levels. By being proactive and understanding these common failure modes, you can effectively address oil leaks and maintain the health of your BMW 640i.

How urgent is the oil leak in my 2012 BMW 640i, and what are the risks of delay?

When faced with an oil leak in your 2012 BMW 640i, it is essential to recognize the urgency of the situation. Oil leaks can significantly compromise engine performance, leading to increased wear and tear, and in severe cases, catastrophic engine failure. The longer you wait to diagnose and repair the leak, the more likely you are to encounter serious issues that could affect the overall functionality and longevity of your vehicle. Ignoring the symptoms not only risks your engine's health but can also lead to costly repairs down the line. Therefore, addressing an oil leak promptly is crucial to maintaining the optimal performance of your BMW 640i and ensuring that you avoid the potential pitfalls associated with delayed repairs. Taking immediate action will help safeguard your investment and keep your vehicle running smoothly.

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Oil Leak Risks in 2012 BMW 640i Causes and Solutions