In the American embassy in Australia the have a device to make the water flow the "right way" down the toilet. ( It's true I saw it on the simpsons.) A bit like Codders big tanks on industrial hydraulic units which are to combat leaks, and nothing at all to do with cooling and having enough oil in the system to fill large unbalenced rams.
hydraulic steering will creep due to the way it handles impact loads (as I understand it.),
As long as it is full of oil and you can't move the ram too much by pushing the engine side to side don't worry about it. Get a symetrical steering wheel and you will hardly notice.