Genuine Mercedes special Oring seal for the bowden cable housing where it connects to the right side of the automatic transmission. This is a common leak area and you may be fooled into thinking it is leaking out of the pan gasket.
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Replacement is not easy without the right tool and instructions. It can be a little "tricky" getting the bowden cable out and back in just to replace this inexpensive o-ring.
For Kent's video instructions as well as the special tool you should have on hand to complete this job see related products.
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