I too just replaced mine, about two weeks after doing a tranny hardline replacement and a full flush. Didn't have any signs of leakage. Got the part at the local Benz dealer, it's a known problem, he had it off the shelve almost sooner than i had finished telling him what was leaking! He mentioned they've been through several types of o-rings to no avail. My car is a daily driver with 113,000.