some months ago i started losing power steering fluid on my merc e320 v6. it was a bit damp around the reservoir and there was a little moisture on the cross member. so i called mercerdes in my area spoke to one of their tech goose. he said it was the o ring in the reservoir which is common. got the o ring done the job went to work and back which is 7 miles same problem again. could not see any sign of leakage underneath. so someone told me and i think it was mercedes tech guy that one of the seals in the steering rack was the problem. how to know that for sure was to take one of the boots off and see if there is any fluid in there. low and behold full of fluid. so i took the rack off. i was told there is a master seal located where the wormdrive entered the rack. this seal is the size of a milk bottle top with a rigid seal. i took the old seal out and i replaced it. eventually got the rack back on. filled it with fluid left it a day, filled it again. i did intend to bleed it that day but the weather changed i had to leave it a while. went back to it yesterday, was told how to bleed it by aa tech guy. he said run the engine turn the steering wheel left to right it will make groans and noises then the steering will become assisted. it was ok for a couple of minutes then the steering went heavy again. checked the reservoir and it was empty. looked underneath and fluid was poring out from one of the gaters. not sure now what the problem may be. would anyone be able to help or any ideas? do u recomend changing the rack all together. the car is a keeper in extremely good condition.