2015 BMW 320i Is Leaking Oil

Discovering the Causes of Oil Leaks in Your 2015 BMW 320i 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 2015 BMW 320i 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 320i 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 320i?

To effectively diagnose an oil leak in your 2015 BMW 320i, start with a thorough visual inspection of the vehicle. Look for any oil stains or puddles beneath the car, as well as signs of oil seepage around the engine components. Next, check the oil levels using the dipstick; low levels can be a clear indicator of a leak. Pay close attention to the engine components, including gaskets, oil pans, and seals, as these areas are common sources of leaks. Additionally, be aware of any unusual symptoms, such as a burning smell emanating from the engine bay, which may suggest oil is leaking onto hot surfaces. If you find it challenging to pinpoint the source of the leak or if the issue persists, it may be wise to consult a certified BMW mechanic for a professional diagnosis. By following this diagnostic approach, you can systematically identify and address the oil leak in your vehicle.

What are the common causes of oil leaks in a 2015 BMW 320i?

When it comes to diagnosing oil leaks in a 2015 BMW 320i, understanding the common culprits is essential for any DIY enthusiast. One of the primary issues is the failure of oil system components, which can lead to significant leaks if not addressed promptly. Additionally, leaking engine gaskets are a frequent source of oil loss, particularly the valve cover gasket, known for its tendency to wear out over time. As the vehicle ages, the deterioration of engine gaskets and seals becomes more prevalent, allowing oil to escape from various points. The oil pan gasket is another critical area to inspect, as it is often a common leak site in BMWs. Furthermore, general wear and tear on seals, valves, and connection points can contribute to oil leaks, making it vital for owners to conduct regular maintenance checks. By being aware of these potential issues, DIYers can take proactive steps to identify and rectify oil leaks, ensuring their BMW 320i remains in optimal condition.

How urgent is it to address the oil leak in my 2015 BMW 320i?

Addressing an oil leak in your 2015 BMW 320i is not just a matter of convenience; it is a pressing issue that demands immediate attention. Ignoring this problem can lead to severe engine stress, which may compromise performance and ultimately result in catastrophic engine failure. Additionally, oil leaks can contribute to overheating, a condition that can inflict further damage on your engine components if left unresolved. The longer you wait to fix the leak, the more extensive and costly the repairs may become, as the issue can escalate and affect other parts of your vehicle. Identifying the source of the leak is crucial for implementing the right solution and preventing additional damage. By promptly addressing the oil leak, you not only safeguard the health of your BMW but also ensure it operates efficiently and reliably. Therefore, it is imperative to take action without delay to maintain your vehicle's performance and longevity.

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2015 BMW 320i Car Leaking Oil: Causes & Repairs | RepairPal