I just changed the oil in my 99 ml 320 using a topsider device.
After making sure everything was tight I started the engine to let the oil circulate before checking it. The engine ran about 20 seconds then I shut it off. When I did I noticed oil leaking and puddling under the vehicle. I checked the oil level and it is now empty.
My question is WHAT HAPPANED??? I had put in 8 quarts of mobil 1 5/50 weight oil.

Thanks, all help appreciated!!!