I'm new to BMWCCA, so this issue might have already been raised. I have a 2000 528i sedan (about 172,000 miles) - just today started hearing a horrible, metal-on-metal grinding sound whenever I drive (also hear it when shifting into reverse - car is an automatic btw). I'll be making an appointment with the shop ASAP, but in the meantime, anyone might know what the issue might be? Not seeing any warning lights. Thanks!