2018 BMW 328d Is Leaking Oil

Discovering the Causes of Oil Leaks in Your 2018 BMW 328d 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 2018 BMW 328d 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 328d 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.

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 2018 BMW 328d?

To effectively diagnose an oil leak in your 2018 BMW 328d, start with a thorough visual inspection of both the engine bay and the area beneath the vehicle. Look for any visible signs of oil, such as puddles or drips, and check for oil stains on engine components. Next, verify the oil levels in the engine; a significant drop may indicate a leak. Pay close attention to the oil filter and drain plug, as these are common areas for leaks. Ensure they are secure and free from oil residue. Additionally, inspect the gaskets and seals for any signs of wear or damage, as leaks often occur at these points. If the source remains elusive, consider conducting a pressure test on the oil system, which can help identify hidden leaks. Should you still be unable to locate the issue, consulting a qualified mechanic or BMW service center is advisable for a professional assessment. By following these steps, you can systematically approach the diagnosis of an oil leak, potentially saving time and money on repairs.

What are the common causes of oil leaks in a 2018 BMW 328d?

When diagnosing oil leaks in a 2018 BMW 328d, it's essential to understand the common problems that may arise. One frequent culprit is the oil pan gasket, which can degrade over time, leading to leaks at the bottom of the engine. Similarly, the valve cover gasket is prone to wear and can allow oil to escape from the top of the engine, creating visible leaks. Another area to inspect is the oil filter housing gasket; if this component fails, it can result in oil seeping around the oil filter, which is often overlooked during routine checks. Additionally, the timing cover can develop leaks, contributing to oil loss, while the crankshaft seal, located at the front of the engine, may also wear out and cause oil to leak. Regular inspections and maintenance can help identify these issues early, allowing DIY enthusiasts to address them before they escalate into more significant problems.

How urgent is it to address an oil leak in a 2018 BMW 328d?

When dealing with an oil leak in a 2018 BMW 328d, understanding the urgency of the situation is crucial for any DIY enthusiast. The severity of the leak plays a significant role in determining how quickly action should be taken. A minor leak may seem manageable, but even small leaks can escalate into major issues if left unattended, leading to substantial oil loss and potential engine damage. Moreover, oil is vital for lubricating engine components; a leak can compromise this lubrication, resulting in increased friction and wear, which can ultimately affect the vehicle's performance and longevity. Safety is another critical factor; oil leaks can create hazardous conditions, such as slippery roads or the risk of fire if oil drips onto hot engine parts. Additionally, delaying repairs can lead to more extensive damage, which not only poses safety risks but can also inflate repair costs significantly. Therefore, addressing an oil leak promptly is essential to ensure the safety of the driver and others on the road, maintain optimal engine performance, and avoid escalating repair expenses.

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