2015 BMW 428i XDrive Gran Coupe Is Leaking Oil

Identifying the Causes of Oil Leaks in Your 2015 BMW 428i xDrive Gran Coupe and How to Address Them

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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 428i xDrive Gran Coupe 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 428i xDrive Gran Coupe 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.

How to diagnose an oil leak in a 2015 BMW 428i xDrive Gran Coupe?

To effectively diagnose an oil leak in your 2015 BMW 428i xDrive Gran Coupe, start with a thorough visual inspection under the vehicle. Look for any oil puddles or drips that may indicate the location of the leak. Next, regularly check your oil levels; a significant drop can signal a leak that needs immediate attention. Pay close attention to the engine components, particularly the oil filter housing, oil pan, valve cover gasket, and oil cooler, as these are common areas where leaks occur. If the source remains elusive, consider adding UV dye to the engine oil, which can help illuminate the leak under UV light. Additionally, be mindful of any burning oil smells while driving, as this could further indicate a leak. If these steps do not lead to a clear diagnosis, consulting a mechanic or a BMW specialist is advisable for a more comprehensive evaluation. By following this diagnostic approach, you can systematically identify and address oil leak issues in your vehicle.

What are the common causes of oil leaks in a 2015 BMW 428i xDrive Gran Coupe?

When diagnosing oil leaks in a 2015 BMW 428i xDrive Gran Coupe, 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 engine gaskets, particularly the valve cover gasket, which is often the first to show signs of wear in newer BMW models. As these vehicles age, the plastic valve cover can warp or crack, exacerbating the issue. Additionally, other seals and gaskets, such as the oil filter housing gasket, oil pan gasket, and main engine seal, are frequent sources of leaks. The challenge in identifying the exact source of an oil leak lies in the fluid's tendency to drip down into lower areas or burn off during operation, making a thorough inspection crucial. Regular maintenance and prompt attention to any signs of oil leakage can help prevent more severe engine damage and costly repairs, ensuring the longevity and performance of your BMW.

How urgent is it to address the oil leak in my 2015 BMW 428i xDrive Gran Coupe?

Addressing an oil leak in your 2015 BMW 428i xDrive Gran Coupe 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 significant drop in oil levels, which compromises the lubrication of essential engine components. This lack of lubrication can result in severe engine damage over time, leading to costly repairs that could have been avoided. Additionally, persistent low oil levels can cause the engine to overheat, further exacerbating wear and tear on critical parts. The safety implications are also considerable; leaking oil can drip onto hot engine components, creating a fire hazard that poses a risk to both the vehicle and its occupants. Therefore, it is crucial to address any signs of an oil leak promptly to ensure the longevity and optimal performance of your BMW, as well as to safeguard against potential safety risks.

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2015 BMW 428i xDrive Gran Coupe Oil Leak Issues & Repairs