2018 Mazda 6 Is Leaking Oil

Diagnosing Oil Leak Sources in Your 2018 Mazda 6 and Effective Repair Strategies

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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 Mazda 6 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 Mazda 6 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 Mazda 6?

When diagnosing an oil leak in your 2018 Mazda 6, it's essential to adopt a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by locating the leak; inspect the area beneath your vehicle for any visible oil spots or drips, as this can provide immediate clues about the source. Next, turn your attention to the oil pan, as cracks or damage here are common culprits for leaks. Ensure that the oil filter is securely installed, as a loose or damaged filter can also lead to oil escaping. Don’t overlook the oil drain plug; it should be tight and free from any signs of oil seeping around it. Additionally, examine the gaskets and seals within the engine, as wear and tear can result in leaks. Regularly monitoring your oil levels is crucial, as a significant drop over time may indicate a persistent leak. If these steps do not reveal the source of the problem, or if the leak continues, it may be time to consult a professional mechanic for a more thorough inspection and repair. By following this diagnostic approach, you can effectively identify and address the oil leak in your vehicle.

What are the common causes of oil leaks in a 2018 Mazda 6?

When diagnosing oil leaks in a 2018 Mazda 6, it's crucial to understand the common problems that may arise. One frequent culprit is the oil pan gasket, which can degrade over time, leading to leaks that can compromise engine performance. Similarly, the valve cover gasket is another area to inspect, as wear and tear can result in oil seepage. Additionally, a leaking oil filter, often due to improper installation or a loose fit, can contribute to oil loss. It's also important to check the oil drain plug; if it is damaged or not securely tightened, it can be a source of leaks. Lastly, keep an eye on the seals around engine components, such as the camshaft and crankshaft seals, as these can crack or wear out, leading to further oil leakage. Addressing these issues promptly through regular maintenance and inspections is essential to maintain the vehicle's performance and prevent potential engine damage.

How urgent is it to address the oil leak in my 2018 Mazda 6?

Addressing an oil leak in your 2018 Mazda 6 is not just a matter of routine maintenance; it is a pressing issue that requires immediate attention. An oil leak can severely compromise the engine's lubrication system, leading to increased friction among engine components, which can result in significant wear and tear over time. This deterioration can escalate into more severe problems, such as a loss of oil pressure, which may cause the engine to overheat and ultimately fail. Moreover, the safety risks associated with an oil leak cannot be overlooked; oil dripping onto hot engine parts poses a fire hazard that could endanger both the vehicle and its occupants. By addressing the leak promptly, you not only safeguard your engine's health but also prevent potentially costly repairs down the line. Therefore, if you notice any signs of an oil leak, it is crucial to act swiftly to maintain the performance and safety of your Mazda 6.

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