2015 BMW M235i Is Leaking Oil

Discovering the Causes of Oil Leaks in Your 2015 BMW M235i and How to Address Them Effectively

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Reviewed by
Bo Fader
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 M235i 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 M235i 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 steps to diagnose the oil leak in a 2015 BMW M235i?

To effectively diagnose an oil leak in your 2015 BMW M235i, start with a thorough visual inspection of the vehicle. Look for any visible oil spots on the ground where the car is parked, as well as signs of oil accumulation around the engine bay. Next, check the oil levels using the car's oil level indicator to ensure they are within the recommended range. This step is crucial, as low oil levels can exacerbate leaks. After confirming the oil level, inspect key engine components such as the valve cover, oil pan, oil cooler, and oil filter housing for any signs of seepage or leaks. If the source of the leak remains elusive, consider adding UV dye to the engine oil; this will help you trace the leak more effectively under UV light. Additionally, pay attention to any unusual burning oil smells while driving, as this can indicate a leak, and listen for sizzling or popping sounds that may occur if oil is leaking onto hot engine parts. If these steps do not lead to a clear diagnosis, it may be wise to consult a qualified mechanic for a more comprehensive evaluation. By following this diagnostic approach, you can systematically identify the source of the oil leak and take appropriate action.

What are the common causes of oil leaks in a 2015 BMW M235i?

When dealing with oil leaks in a 2015 BMW M235i, it's crucial to understand the common problems that can arise. One of the primary culprits is the failure of seals and gaskets, particularly the valve cover gasket, oil filter housing gasket, oil pan gasket, and main engine seal. These components are essential for maintaining a tight seal within the engine, and when they wear out or become damaged, oil can escape, leading to leaks. Additionally, oil system component failures can contribute to leaks, as can deteriorating engine gaskets. If you notice oil pooling under your vehicle or detect a burning oil smell, it may indicate a leak from one of these critical areas. Regular inspections and prompt replacement of any worn gaskets or seals are vital to prevent further issues and maintain the performance of your BMW M235i. By staying proactive, you can address these common problems before they escalate into more significant repairs.

How urgent is it to address the oil leak in my 2015 BMW M235i?

Addressing an oil leak in your 2015 BMW M235i is not just a matter of routine maintenance; it is an urgent necessity that can significantly impact your vehicle's performance and longevity. Ignoring an oil leak can lead to severe engine stress, resulting in diminished performance and potential overheating, which may culminate in catastrophic engine failure. Given that the engine is the most costly component to repair or replace, timely action is essential to avoid escalating repair costs. Furthermore, oil leaks can stem from various underlying issues, making it crucial to identify the source quickly to implement the right fix. Delaying repairs not only exacerbates the problem but can also lead to more extensive damage, ultimately compromising your vehicle's safety and reliability. Therefore, if you notice any signs of an oil leak, it is imperative to address the issue immediately to safeguard your BMW M235i's performance and prevent costly repairs down the line.

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2015 BMW M235i Oil Leak Causes & Repair Costs | RepairPal