2. The spark plug is the vital part which is basically used to generate the spark to ignite the fuel and air mixture of your car in the internal combustion chamber.

3. When you run the car, the oil also plays an important role in lubricating the components of the engine.

4. If your engine doesn't have enough supply of oil, then it will overheat from all the friction by moving components rubbing against each other.

5. The oil leaking in the spark plugs of your car creates a huge problem with the functionality of the engine and its performance.

6. The below points define the causes behind the leaks in your car's spark plug tubes.

7. Damaged valve cover gasket

8. The engine of your car has a metal part know as a valve cover gasket that is used to keep the engine sealed to prevent the oil leaks.

9. The heat generated from the engine will damage the valve cover gasket that can eventually crack and shatter and allow the oil to leak through it.

10. If you catch the problem initially, then repair the valve cover gasket of your car. Otherwise, the engine will suffer permanent damage.

11. Failed o-ring seals

12. The O-ring seals are presented under the spark plug well and become failed or worn out when the oil leak through it.

13. If you don't repair it as soon as possible, then it can eventually affect the engine of your car.

14. Thus, the oil-saturated within the spark plugs, so you need to replace the spark plug at the same time.

15. Worn piston

16. When the piston of your car will get too much heat, it will eventually crack. Then it will cause knocking and rattle bit sounds.

17. However, it will also cause leakage in the spark plugs, engine misfiring and experience a weaker engine performance.

18. If the piston rings of your car are not replaced, then it will ruin your engine completely and all of its components.

19. Old valve guide

20. For managing the intake of air into the engine, all car depends on the assistance of valve guides.

21. Thus, the valve guides of your car are secure and perform the operation of the engine, but wear out when you are using your car continuously.

22. You need to replace the old valve guide of your car to prevent the oil from leaking into the spark plugs.

23. Damaged piston compression rings

24. Generally, the piston compression rings are placed on the top and bottom of the piston of an internal combustion engine.

25. The main purpose of the compression ring is to stop the oil from entering the combustion chamber by removing the extra oil from the cylinder walls.

26. When the compression rings are damaged, they unable to stop the oil from flowing towards the spark plugs.

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