What causes the abnormal engine noise in my BMW 6 Series?

I have noticed a strange knocking sound coming from my BMW 6 Series' engine. What could be causing this and how can I fix it?

The abnormal engine noise is likely caused by worn out or damaged engine bearings. This can be avoided by regularly changing your oil and using high-quality oil filters. It is recommended to replace the bearings as soon as possible to prevent further damage to the engine.

Another potential cause of the abnormal engine noise could be a faulty spark plug. It is important to have your spark plugs checked and replaced if necessary to ensure proper engine performance and to avoid any damage to the engine.