On my BMW X5 the power steering cooler hoses have a suspected minor seepage on the crimp where they connect to the cooler, the pipe going to the rack is oily about half way down the engine bay, The power steering fluid it uses is ATF, its been like this for a year but power steering level never reduced. My question is will they oily layer one the outside of the hose damage it causing it to rupture? they look fine at the moment no swelling or anything, the material seems same as ATF cooler hoses on Mercedes. I don't want to replace it unless neccessary as its 400 quid for that hose from BMW and difficult to get to the steering rack and there is no reduction oil level. if ATF is traveling inside that hose wouldn't that mean ATF on the outside wont harm it either?