I've got a 2000 BMW 320d, and everytime i drive it for a long distance, it just completely looses speed. It feels like the car dont get enough fuel through or something. I had the car checked by numerous of car carages and no one could help me.... Any advice or help?

Run some STP or Gumout for diesel to clean up the fuel lines and injectors. It has nothing to do with the turbo (there is only one) if it was having problems the car would barely run. Check your thermostat and computer.