Those 3.0 are fabulous cars, anything pillarless from the era gets me going. There's a local one that's street parked daily, silver over black I believe, and not a junker by any stretch. He also owns a Clown Shoe coupe. When I lived in Hancock Park, a block from the LA Tennis Club, there was one in the same Aubergene as the Hemmings linked one, always parked out front that I'd admire on walks with the hound.
Your M5 is probably one of the best and most reliable BMWs made, great clean-line design as well. Even the standard model turns my head still.
I'm also the second owner of my coupe, bought by a family in NorCal and used from new until about 8-years ago when I picked her up. I stole it from the shop, no idea why they had it priced so low and less idea why they accepted my offer, but here she sits. Mine has lots of small cosmetic needs being a genuine survivor, seats a bit of a mess too, but the interior is pretty good otherwise including those wide swaths of leather covering everything you see from the seat backs to the door cards to the interior of the glove box. White over Red. I've posted here in the automotive thread but here she is again. I'd love to see your BMWs too!