Buick lucerne squealing engine

[Klein00]

My 2008 v6 Buick lucerne makes a very loud squealing sound when running and gets louder with acceleration. I removed drive belt completely and started car without it and still same sound. What's causing this?

[carriedi]

can you tell where on the engine the sound is coming from? Front? Rear? left? Right? Is it a squeal like metal rubbing on metal? Or, is it more like a whistle? If it gets louder on acceleration does it go away on deceleration? Is your engine normally aspirated?

It is very difficult to diagnose a noise with hearing it and hear where it is coming from.

If it does sound like some thing squealing in the engine because it's not getting oil or something I would have a shop listen to it and have them give you their opinion.