2013 BMW 335i Is Leaking Oil

Discovering the Causes of Oil Leaks in Your 2013 BMW 335i and How to Address Them Effectively

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Reviewed by
Andrew Hajjar
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 2013 BMW 335i 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 2013 BMW 335i 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 2013 BMW 335i?

To effectively diagnose an oil leak in your 2013 BMW 335i, start by conducting a meticulous inspection of the engine compartment. Begin at the top, checking areas such as the oil filter and head gasket for any signs of oil seepage. A clean engine compartment can help you spot leaks more easily, so consider cleaning it beforehand. Next, examine the ground beneath your vehicle for oil stains, which can provide clues about the leak's location. Pay attention to common leak sources, including gaskets, oil pans, and seals, as these are often culprits in oil leaks. It's crucial to differentiate between various types of fluid leaks, as this can help you pinpoint whether the issue is indeed engine oil or another fluid. Remember that oil leaks may not always be immediately visible; they can drip down to lower areas or burn off while driving, complicating the diagnosis. By following this structured approach, you can systematically identify the source of the leak and determine the necessary steps for repair.

What are the common causes of oil leaks in a 2013 BMW 335i?

When dealing with oil leaks in a 2013 BMW 335i, it's crucial to understand the common culprits that may be at play. One of the primary sources of leaks is the valve cover gasket, which can wear out over time, leading to oil seeping out. Additionally, the oil filter housing gasket is another frequent offender, often causing oil to leak on the left side of the engine or giving the impression that the oil is coming from the oil pan. Other potential leak sources include the cam cover, oil pan, and rear main seal, all of which can deteriorate as the vehicle ages. It's also important to consider that engine gaskets and seals may fail, resulting in less obvious leaks that can drip down into lower areas or burn off while driving. Identifying these issues early is essential for maintaining your BMW's performance and preventing more significant damage, making it vital for DIY enthusiasts to be aware of these common problems.

How urgent is it to address the oil leak in my 2013 BMW 335i?

Addressing an oil leak in your 2013 BMW 335i is not just a matter of convenience; it is a critical maintenance task that should be prioritized to avoid severe repercussions. An oil leak can lead to a gradual decrease in oil levels, which compromises the engine's ability to lubricate its moving parts effectively. This inadequate lubrication can result in increased friction, overheating, and ultimately, catastrophic engine failure. Moreover, the presence of an oil leak often signals underlying issues with essential components such as the oil system or engine gaskets, which, if left unaddressed, can escalate into more extensive and costly repairs. Ignoring the symptoms of an oil leak not only jeopardizes the longevity of your vehicle but also poses safety risks, as low oil levels can lead to unpredictable engine behavior. Therefore, it is imperative to identify and rectify the source of the leak promptly to ensure the safe and efficient operation of your BMW 335i.

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