2018 BMW 320i XDrive Is Leaking Oil

Identifying the Causes of Oil Leaks in Your 2018 BMW 320i xDrive 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 2018 BMW 320i xDrive is leaking oil are oil system component failure and leaking engine gaskets.
  • Oil System Components: A worn or damaged oil pump or filter can lead to low oil pressure, resulting in 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 2018 BMW 320i 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 steps should I take to diagnose the oil leak in my 2018 BMW 320i xDrive?

When diagnosing an oil leak in your 2018 BMW 320i xDrive, it's crucial to follow a methodical approach that prioritizes simpler checks before moving on to more complex diagnostics. Begin by locating the leak; inspect the ground beneath your vehicle for any signs of oil drips or pooling, and examine the engine and transmission for wet spots or oil stains. Next, check the oil level to see if it is significantly lower than normal, which could indicate a leak. Pay close attention to the oil filter and drain plug, ensuring they are secure and free from damage. Additionally, inspect the gaskets and seals, such as the valve cover and oil pan gaskets, as wear and tear can lead to leaks. For a more thorough investigation, consider using UV dye in the engine oil; after running the engine, a UV light can help you identify the leak's source by illuminating the dye. If these methods do not yield results, performing a pressure test on the oil system can help pinpoint any hidden leaks. However, if you find the diagnosis challenging or are uncomfortable with the process, consulting a qualified mechanic is advisable, as they possess the expertise and tools necessary for accurate diagnosis and repair.

What are the common causes of oil leaks in a 2018 BMW 320i xDrive?

When diagnosing oil leaks in a 2018 BMW 320i xDrive, it's crucial to understand the common culprits that may be at play. One of the primary causes is the degradation of gaskets and seals, which can occur over time due to exposure to heat and engine vibrations. This wear can lead to leaks that may not be immediately visible. Additionally, the oil pan itself can become worn or develop cracks, especially if the vehicle has been subjected to rough driving conditions or impacts. Another frequent issue is a faulty oil filter housing gasket, which can allow oil to escape into the engine compartment, creating a mess and potential hazards. Valve cover gasket leaks are also common, as these gaskets can deteriorate, leading to oil seepage that may drip onto other engine components. Lastly, don’t overlook the oil cooler, as leaks or damage in this area can also contribute to oil loss. Addressing these issues promptly is essential not only for maintaining engine performance but also for preventing more severe damage down the line. Regular inspections and maintenance can help you catch these problems early, allowing for effective DIY repairs.

How urgent is it to address an oil leak in a 2018 BMW 320i xDrive?

When it comes to an oil leak in your 2018 BMW 320i xDrive, the urgency of addressing the problem cannot be overstated. An oil leak not only jeopardizes the engine's lubrication, which is vital for its smooth operation, but it also poses significant safety risks. A leaking oil can create hazardous driving conditions, increasing the likelihood of accidents due to slippery roads. Moreover, the environmental implications of oil leaks are serious, as they can lead to soil and water contamination. Ignoring this issue can result in more severe engine damage, leading to costly repairs and potentially leaving you stranded. Therefore, it is essential to act swiftly to repair any oil leaks, ensuring the safety of both the vehicle and its occupants while also protecting the environment. Taking prompt action will help maintain your BMW's performance and longevity, making it a crucial step for any responsible vehicle owner.

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