Q:

Why would there be oil around spark plugs?

A:

Quick Answer

The most common cause of oil fouling on a spark plug is caused by badly worn piston rings or cylinder walls within the automobile's motor. Oil can also be pulled into the chamber because of excessive clearance in the valve stem guides.

Know More

Full Answer

Oil fouling around the top of the spark plug can also be caused by badly worn valve stem seals. If a PCV valve is inoperative or plugged, there can be a buildup of crankcase pressure, which can force oil vapors and oil past the valve guides and rings and into the engines combustion chamber. It is important that an engine run at the right temperatures while also using the proper grade of gasoline in order to avoid any issues with spark plug fouling.

Learn more about Car Parts & Maintenance
Sources:

Related Questions

  • Q:

    Why do you have to gap spark plugs?

    A:

    It is necessary to set the gap of a spark plug during installation as it could misfire, experience loss of power or cause poor fuel economy, according to NGK Spark Plugs. Not properly setting the gap can also foul the plug and quickly wear it down.

    Full Answer >
  • Q:

    Why is there oil in my spark plug wells?

    A:

    Oil appears in the spark plug well when there is a leaking valve cover gasket or when an O-ring weakens or loosens. Each spark plug has an O-ring that prevents oil leaks. When the O-ring breaks, oil begins to pool in the spark plug well. The valve cover gasket also causes oil leaks when it is worn out or not installed correctly. Valve cover gaskets are typically mounted on top of an engine to prevent oil from leaking onto other mechanical parts, such as the spark plugs.

    Full Answer >
  • Q:

    Why is my oil leaking into the spark plugs?

    A:

    Oil leaking onto the spark plugs generally means that a valve-cover gasket has failed. Over time, these contract and get hard before allowing oil through. On a V-type engine, the leak shows up on the garage floor or driveway, but four-cylinder engines show the leak on the spark plugs.

    Full Answer >
  • Q:

    How long do spark plugs last?

    A:

    The length of time that spark plugs last depends on the number of miles driven and the type of spark plug a vehicle has installed. Spark plugs are typically changed every 45,000 miles, but some spark plugs are advertised to last as long as 100,000 miles.

    Full Answer >

Explore