2016 BMW M235i Is Leaking Oil

Discovering the Causes of Oil Leaks in Your 2016 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 2016 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 2016 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 2016 BMW M235i?

To effectively diagnose an oil leak in your 2016 BMW M235i, start by identifying the leak's location. Carefully inspect areas such as the oil pan and engine gaskets, as these are common culprits. Look for any oil pooling beneath the vehicle, which can provide clues about the leak's source. Pay attention to any unusual sounds, like sizzling or popping, that may indicate oil is leaking onto hot engine components. A thorough visual inspection is crucial; check for oil residue around the engine bay and specific parts like the lambda monitor sensor. Utilizing diagnostic tools, such as ISTA, can help you uncover any error codes that may relate to the oil leak or other engine issues. Finally, clean the area around the suspected leak and take the car for a short drive to help pinpoint the exact source of the leak. By following these steps, you can systematically approach the diagnosis of an oil leak, making it easier to address the issue effectively.

What are the common causes of oil leaks in a 2016 BMW M235i?

When dealing with oil leaks in a 2016 BMW M235i, it's essential to understand the common problems that can arise within the vehicle's oil system. One prevalent issue is the failure of oil system components, which can lead to significant leaks if not addressed. Additionally, leaking engine gaskets, particularly the valve cover gasket, are frequent culprits that can allow oil to escape from the engine. Another area to inspect is the oil filter housing gasket, which can also develop leaks over time. Identifying these issues early is crucial, as they can lead to more severe engine damage if left unattended. For DIY enthusiasts, a thorough inspection of these components can help pinpoint the source of the leak, allowing for timely repairs and maintenance to keep the M235i running smoothly.

How urgent is it to address the oil leak in my 2016 BMW M235i?

Addressing an oil leak in your 2016 BMW M235i is not just a matter of convenience; it is a critical maintenance task that demands immediate attention. Ignoring an oil leak can lead to severe engine performance issues, including overheating and, in the worst-case scenario, complete engine failure. The engine is particularly vulnerable, and oil leaks often originate from specific areas that require careful inspection. While some leaks may be subtle, with oil dripping into lower areas or burning off during operation, the consequences of inaction can escalate quickly. Depending on the severity of the leak, repairs can range from a straightforward gasket replacement to more complex fixes involving engine components. Therefore, it is essential to act promptly to prevent further damage and ensure your vehicle continues to perform optimally. Taking the time to diagnose and repair the leak will not only safeguard your engine but also enhance the longevity and reliability of your BMW M235i.

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