What Does It Mean When Spark Plugs Have Oil on Them?

Apr 7


Emily Sara

Emily Sara

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As soon as you see oil in the spark plug wells or threads, make an appointment with a car garage in Reading. It's possible that if this problem isn't addressed quickly, your entire engine will fail.


A failed gasket or an O-ring can create oil on a spark plug for a variety of reasons. Spark plugs are in charge of ensuring that the ignition system's electrical current is delivered to the combustion chamber. Oil leaks,What Does It Mean When Spark Plugs Have Oil on Them? Articles which are indicated by the presence of oil on a spark plug, might obstruct the proper passage of electric current.

Metal shells are common in spark plugs, and the electrode is usually coated in porcelain to keep it insulated. That implies that an oil spill might be extremely dangerous.

On the other hand, oil seeping into the spark plugs is never a good thing. This will have a significant impact on the way your engine works and performs. 

Maybe you discovered oil in your spark plug wells while doing routine maintenance. Maybe you discovered oil-covered spark plugs when looking into why your car's oil level was low. Take your vehicle to a car garage in Reading to get this problem looked into by a specialist and fixed before it becomes worse.

The following are oil in spark plug well symptoms:

  • Failing Piston - A failing piston will be unable to house the compression rings at the bottom and top of the engine, allowing oil to spill onto a spark plug. Aside from that, the heat has the potential to cause the pistons to fail. If the pistons are overheated, they develop cracks and become subject to oil leaking. It's a condition that may be pretty significant, and it has to be addressed right once if you see it. If the piston develops a crack or a hole, it must be replaced rather than repaired at a garage in Reading.
  • Leaking Valve Cover Gaskets - This is a metal cover that is located at the end of the engine and helps to prevent oil from leaking into the engine. The gaskets are located between the engine and the valve cover. It is common for gaskets to fail on a regular basis, exposing seeping oil into the engine. The gaskets are particularly affected by high temperatures since they become brittle and begin to leak oil. The leak travels up to the spark plugs, causing them to malfunction. If this happens, you'll need to replace the valve cover gasket immediately. You must check the oil level and look for any leaks on a regular basis. It's a clue that there's a leak in the system if you notice filthy oil, blocked filters or unclean oil. If you ignore it, it might cost you a lot of money in repairs.
  • Failing O-Ring Seals - These are the seals found at the bottom of the spark plugs. They may allow oil to pass through if they are faulty, causing engine damage. If you see oil surrounding the spark plug, especially towards the bottom, you should try to determine the problem right away. There is a significant concern if there is a misfire and oil in the spark plug well. It might be the beginning of an engine misfire, which could escalate to significant issues. If the O-ring seals are damaged, you must repair or replace them. However, if this occurs, you must replace both the spark plug and the O-rings as soon as possible. 
  • Piston Compression Rings Failing - This is located at the bottom and top of the car's engine. They are in charge of preventing oil from entering the combustion chamber. They also help to ensure that the extra oil on the engine cylinder walls is eliminated. If these rings break, the oil may leak past the pistons, producing a flow of oil into the system on spark plug wires or spark plugs, creating a variety of difficulties.
  • Valve Guides That Have Been Worn - The valve guides are responsible for regulating air intake by ensuring that the valve is in place when the engine is running. If they have been worn out, the only option is to replace them. If you don't replace them, the spark plugs will become subject to oil leaking. When the valve guides wear out, it can cause serious engine problems, which is why you should repair them as soon as you notice a problem.