Found a website that explains much better then I could...
Hope it helps you guys and avoid getting con by irresponsible mechs...
http://www.bmwe34.net/E34main/Maintenance/Engine/headgasket_M30.htm
Hope it helps you guys and avoid getting con by irresponsible mechs...
http://www.bmwe34.net/E34main/Maintenance/Engine/headgasket_M30.htm