How to fix rattling noise from BMW XM's engine?

I've noticed a rattling noise coming from the engine of my BMW XM. It's quite loud and concerning. What could be causing this and how can I fix it?

The most common cause of rattling noise in the engine is old or worn-out timing chain tensioner. It's important to get this fixed as soon as possible to avoid further damage to your engine. I would recommend taking your BMW XM to a certified mechanic for a proper diagnosis and repair.

Another possible cause of rattling noise could be a loose heat shield. This is a relatively minor issue and can be fixed easily by tightening the bolts or replacing the heat shield. However, I still recommend taking your car to a mechanic to get it checked out.

In some cases, the rattling noise can also be caused by low engine oil or a dirty oil filter. Make sure to check your oil levels and change your filter regularly. If the noise persists, it's best to get it checked by a professional.