I have a 1998 EC 200 which now is losing all it's gear box oil. There is no sign of external loss so believe it is leaking through the crank shaft seals and being burnt off ? Could this be the case and if so does any one know if you have to split the cases to replace the seals or can this be done with the crank in place ? Through the link on here I have found an owners manual but no workshop manual, any help in locating one would be much appreciated . Many thanks in advance.