2018 Honda Civic Is Leaking Oil

Discover the Common Causes of Oil Leaks in Your 2018 Honda Civic 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 2018 Honda Civic 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 Honda Civic 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 steps should I take to diagnose the oil leak in my 2018 Honda Civic?

When diagnosing an oil leak in your 2018 Honda Civic, it's essential to adopt a systematic approach that begins with the most straightforward checks before progressing to more complex diagnostics. Start by parking your vehicle on a level surface and visually inspecting the engine and surrounding areas for any visible signs of oil, such as puddles or stains. Next, check the oil level using the dipstick; a significant drop may indicate a leak. Pay close attention to the oil filter and drain plug, ensuring they are secure and free from leaks. Additionally, examine the gaskets and seals around critical engine components for any signs of wear or damage. If the source of the leak remains elusive, consider adding UV dye to the oil, which can help illuminate the leak under a UV light. For more advanced diagnostics, a pressure test of the oil system can pinpoint the leak's location. If these steps do not yield results, seeking assistance from a professional mechanic is advisable to ensure a thorough inspection and proper repair. By following this methodical approach, you can effectively identify and address the oil leak in your vehicle.

What are the common causes of oil leaks in a 2018 Honda Civic?

When dealing with oil leaks in a 2018 Honda Civic, it's crucial to understand the common problems that may arise. One frequent issue is the degradation of the oil pan gasket, which can wear down over time, leading to oil seepage. Additionally, a worn-out oil drain plug can also be a source of leaks, as it may fail to create a proper seal. Another area to inspect is the valve cover gasket, which can deteriorate and allow oil to escape from the engine. Problems with the oil filter, such as a loose connection or a faulty seal, can further contribute to leaks. Lastly, it's important to ensure that the engine is not overfilled with oil, as excess pressure can cause various seals and gaskets to fail. By identifying and addressing these common causes, DIYers can effectively manage oil leaks and maintain their Honda Civic's performance.

How urgent is it to address the oil leak in my 2018 Honda Civic?

Addressing an oil leak in your 2018 Honda Civic is not just a matter of routine maintenance; it is a critical issue that demands immediate attention. An oil leak can lead to a rapid decrease in oil levels, which compromises the engine's lubrication system, increasing the risk of severe engine damage. Furthermore, if left unchecked, the leak can cause the engine to overheat, potentially resulting in catastrophic mechanical failures that could leave you stranded or necessitate costly repairs. The safety implications are equally concerning, as leaking oil can drip onto hot engine components, creating a fire hazard. By prioritizing the repair of an oil leak, you not only safeguard your vehicle's performance and longevity but also ensure your safety on the road. Therefore, it is essential to act swiftly and address any signs of an oil leak to prevent further complications and maintain the reliability of your Honda Civic.

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2018 Honda Civic Leaking Oil: Causes & Repair Costs