I just posted a request for information/suggestions yesterday on the coolant leak problem on my '90 750iL . I appreciate the helpful responses I received. Thank you.
But let me tell you what I discovered after my car was towed back to my house.
I requested a flat-bed tow-truck, but they didn't send one. Instead they towed the car from the rear end, hoisting it up by the rear wheels.
When I inspected my car afterwards, I found that they had angled the lift bar in such a way that the clearance between the rear end of my car and the lift bar was too close ---- they ended up crushing the fuel tank.
I will never have my car towed again on anything but a flat-bed tow-truck.