Here's why:
* Oil in the spark plug chamber is a sign of a problem. It could indicate worn piston rings, a faulty valve seal, or even a cracked cylinder head. These issues allow oil to seep past the combustion chamber and into the spark plug well.
* Oil contaminates the spark plug. This can lead to misfires, poor combustion, and even damage to the spark plug itself.
* Oil in the chamber can lead to pre-ignition. This is when the fuel ignites before the spark plug fires, causing a detonation that can damage the engine.
If you see oil in your spark plug chamber, it's important to have your Jaguar XJ8 inspected by a mechanic as soon as possible. They can diagnose the cause of the problem and recommend the necessary repairs.
