Can't tell you how easy but while my E420 was in for another job, they found power steering reservoir leaking. Totla cost to remove replace seals, fluid, gaskets and hose was $162.00 , so I think I would maybe try and fix myself. Can't be that difficult. By the way, my car had 59,000 miles when this happened,,,,must be a E420 thing

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95 E420 ( 76K) SOLD
85 380SE(125k)
95 SL500(72k)