2018 BMW I3s Is Leaking Oil

Discovering the Causes of Oil Leaks in Your 2018 BMW i3s and How to Address Them Effectively

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Reviewed by
Devin Cabugcal
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 i3s 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 i3s 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.

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 steps to diagnose the oil leak in a 2018 BMW i3s?

To effectively diagnose an oil leak in your 2018 BMW i3s, begin by thoroughly inspecting the underside of the vehicle for any visible oil spots or drips, as this can often lead you directly to the source of the leak. Next, check the engine oil level; a significant drop may indicate a leak that needs addressing. Pay special attention to the oil filter and drain plug, as these areas are common sources of leaks—tightening a loose drain plug can sometimes resolve the issue. Additionally, examine the gaskets and seals for any signs of wear or damage, as these components frequently contribute to oil leaks. If the leak remains undetected, consider adding UV dye to the engine oil and running the engine; using a UV light can help illuminate the leak's location. For a more comprehensive assessment, performing a pressure test on the oil system can help identify leaks in hoses or fittings. If these steps do not lead to a resolution, it may be wise to consult a professional mechanic or a BMW service center for a thorough diagnosis and repair. By following this structured diagnostic approach, you can systematically identify and address the oil leak, ensuring your vehicle operates smoothly.

What are the common causes of oil leaks in a 2018 BMW i3s?

When diagnosing oil leaks in a 2018 BMW i3s, it's essential to understand the common culprits that may be at play. One of the primary issues is degraded gaskets, which can occur over time due to heat and wear, particularly affecting the valve cover, oil filter housing, and oil pan gaskets. Additionally, faulty seals in components like the oil filter housing or oil cooler can lead to significant oil loss. Another frequent source of leaks is a loose or damaged oil drain plug, which can allow oil to seep from the oil pan. It's also important to check the condition of the oil filter; an old or improperly sealed filter can contribute to leaks. Lastly, a cracked oil pan, while less common, can be a serious issue that requires immediate attention. Regular maintenance and thorough inspections can help identify these problems early, allowing DIY enthusiasts to address them before they escalate, ensuring the longevity and performance of the vehicle.

How urgent is it to address the oil leak in my 2018 BMW i3s?

Addressing an oil leak in your 2018 BMW i3s is not just a matter of routine maintenance; it is a pressing issue that requires immediate attention. Ignoring an oil leak can lead to a significant drop in oil levels, which compromises the lubrication of essential engine components, increasing the risk of severe engine damage. Furthermore, a leaking oil system can cause the engine to overheat, potentially resulting in catastrophic failures that could leave you stranded or facing costly repairs. The safety implications are equally concerning, as oil dripping onto hot engine parts can ignite, posing a serious fire hazard. Therefore, it is crucial to act swiftly and resolve any oil leaks to safeguard your vehicle's performance and your safety on the road.

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