Hi can anybody help I have a series 60 motor in an international s line. The other night two seal at the back of the motor ( rocker cover) blew out I had them replaced drove about another 100 klms and they blew out again and lost all the oil again. Any-one have any idea what coukld be causing this problem I havent fixed the seals again yet thanks in advance

It seems that the engines blow by is building up pressure in the crankcase and seeking the weakest point to escape, check the emissions system.

yeah, I would look at the crankcase ventilation tube. Under the right conditions, they can become clogged and restricted.