2013 BMW 335is Is Leaking Oil

Discovering the Causes of Oil Leaks in Your 2013 BMW 335is and How to Address 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 2013 BMW 335is 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 335is 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 335is?

To effectively diagnose an oil leak in your 2013 BMW 335is, start by visually inspecting the engine for any signs of oil accumulation or dripping. Focus on common leak points such as the valve cover gasket, oil filter housing, and timing cover gasket, as these are frequent culprits in BMW models. Next, regularly check your oil levels; a sudden drop can indicate a leak that needs immediate attention. Pay special attention to the oil filter area, ensuring that the oil filter cap and surrounding gaskets are secure and free from damage. Additionally, examine the drain plug and oil pan gasket for any signs of wear or looseness. By systematically checking these areas, you can pinpoint the source of the leak and determine whether it requires a simple fix or more extensive repairs, ensuring your vehicle remains in optimal condition.

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

When dealing with oil leaks in a 2013 BMW 335i, it's essential to understand the common problems that can arise within the vehicle's oil system. One of the primary culprits is the oil filter housing gasket, which can wear out over time, leading to leaks. Additionally, the drain plug may become compromised, allowing oil to escape, while a damaged oil pan gasket can also contribute to the issue. It's not uncommon for engine gaskets and seals to deteriorate, particularly as the vehicle ages, resulting in oil seeping through the seams. Another frequent source of leaks is the valve cover gasket, which is known to fail, especially around the 100,000-mile mark. Regular maintenance and thorough inspections can help identify these issues early, allowing DIY enthusiasts to address them before they escalate into more significant problems. By being proactive and understanding these common failure modes, you can effectively manage oil leaks and maintain the performance of your BMW 335i.

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

Addressing an oil leak in your 2013 BMW 335is is not just a matter of routine maintenance; it is a critical issue that demands immediate attention. Ignoring the low oil pressure indicated by the warning light on your dashboard can lead to severe mechanical problems, including catastrophic engine failure. The longer you allow the leak to persist, the more likely you are to experience persistently low oil levels, which can result in significant engine damage that may require costly repairs or even a complete engine replacement. Additionally, oil leaks compromise the lubrication system, leading to decreased engine efficiency and increased wear on vital components. Therefore, it is essential to act swiftly to diagnose and repair the leak, ensuring the longevity and performance of your vehicle while safeguarding your investment.

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