I've done some research after having no clue what I needed to search for and after about an hour I was able to come up with the name of the Delivery Valve so I was able to look up instructions on changing out the o rings. I see that it takes a special socket that seems to be extremely expensive. Are there any cheaper versions of the 617 589 01 09 00 socket that I can buy to do this job?

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86 Mercedes 300SDL - 400k+ miles