2015 BMW 335i XDrive Is Leaking Oil

Discovering the Causes of Oil Leaks in Your 2015 BMW 335i xDrive and How to Resolve 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 335i xDrive 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 335i 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 are the steps to diagnose the oil leak in a 2015 BMW 335i xDrive?

To diagnose an oil leak in your 2015 BMW 335i xDrive, begin with a thorough visual inspection of the engine and surrounding areas. Look for any visible oil stains or puddles, particularly after the vehicle has been parked for a while, as this can indicate the leak's location. Next, pay close attention to the oil lines, especially at the junctions where rubber meets metal, as these are common points for leaks. Inspecting gaskets and seals is also crucial; the valve cover gasket, oil filter housing gasket, oil pan gasket, and main engine seal are frequent culprits in BMWs. If the source of the leak remains elusive, consider adding UV dye to the engine oil, which can be traced with a UV light to pinpoint the leak's exact location. Should you find yourself unable to identify the leak or feel uncertain about your findings, consulting a qualified technician is advisable for a more comprehensive diagnosis and repair guidance. By following this structured approach, you can effectively tackle the issue of an oil leak in your BMW, ensuring your vehicle remains in optimal condition.

What are the common causes of oil leaks in a 2015 BMW 335i xDrive?

When tackling oil leaks in a 2015 BMW 335i xDrive, it's crucial to understand the common sources that may be contributing to the problem. One of the primary culprits is the valve cover gasket, which can deteriorate over time, leading to oil seeping out. Additionally, the oil pan gasket is often a frequent source of leaks, especially as sludge and mineral deposits build up, causing wear and tear. Another area to inspect is the oil filter housing gasket, which is known for its susceptibility to leaks in BMW models. Lastly, the main engine seal can also fail, resulting in significant oil loss. Addressing these leaks promptly is essential, as even minor oil loss can lead to severe engine damage if left unchecked. For DIY enthusiasts, a thorough inspection of these components can help identify the source of the leak, allowing for timely repairs and maintenance.

How urgent is it to address the oil leak in my 2015 BMW 335i xDrive?

Addressing an oil leak in your 2015 BMW 335i xDrive is not just a matter of routine maintenance; it is a pressing issue that requires immediate attention. Ignoring an oil leak can lead to a significant drop in oil levels, which compromises engine lubrication and can result in severe damage to engine components over time. This degradation can manifest as overheating, increased wear on vital parts, and ultimately, costly repairs that could have been avoided with timely intervention. Moreover, the safety risks associated with oil leaks cannot be overlooked; oil dripping onto hot engine components poses a fire hazard, making it imperative to act swiftly. By prioritizing the repair of an oil leak, you not only safeguard your vehicle's performance and longevity but also ensure your safety on the road.

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