OK, it's not in one of my diesels, but there seems to be a lot of evil servo knowledge here.

In my new '79 450SL the servo will make a 7-10 second long squeal when ever the key is turned to the run position, or when it is turned from the run position to off. After the 7-10 seconds it makes no noise and it seems to work fine. I have a receipt from the PO replacing the servo a few years back and it seems to be the aluminum body type. What gives, and how can I fix it?

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine