A mate of mine was checking out my car, and we started it up and sounded fine, but then we slowly winded up the throttle and at around 2K a slight grinding noise, like dry bearings started, and the more we opend it up the worse it got. It was defiently coming from the back of the engine, but when u dropped back to idle it was gone. I drove the car home about 60K away and i got home and did the same thing, but no noise no grinding sounded fine. We my mate checked it out the engine was cold. I think mabye it needed time to warm up but not sure. I'm just concerned about bearing damage from the grinding, does anyone know what it could be or do i just need to warm her up? Thanks. By the way it's a VR V6 Series 2 Engine, not-ecotec.