I have a 92 325i that just stalled on the interstate. Fluids are good, Cams are in correst position and gears are aligned. It was running fine but just quit... Why would I get 0 compression on all 6 cylinders out of nowhere?
Sounds like all your valves are open or broken/bent, did you take off the valve cover to inspect? If it was a piston problem you would likely at least have a tiny bit of compression in at least 1 cylinder.