After I checked rear rotors on my '99 E300 I noticed that the differential cover is kind of wet. Should I re-lock the bolts - if so what is the torque? Do I need to drain + re-fill the differential case? If yes do I need a 14 mm allen for the fill plug and 17 mm for the drain plug? Is there a gasket between cover and case?

Thankx, Pat

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pat201