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  #1  
Old 07-22-2008, 01:24 PM
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300E 4matic differential

I recently checked the level in the front differential and it was more than full. Can engine oil contaminate the differential? If so what am I faced with for a repair? Thanks for all past and future help.

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Old 07-22-2008, 01:45 PM
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Location: Cicero, Hamilton County, Indiana about 30 miles north of downtown Indianapolis
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How much over full was it?

Also, do you suspect there is engine oil in it? Engine oil is a good lube, but a bit light for a differential. Why don't you drain or suck it out with a "mighty vac"? Draining is easier if that is possible and replace with new oil designed for gear work, per your car owners manual. It probably takes about a quart.
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Old 07-22-2008, 05:37 PM
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I don't know if it is engine oil. It may be that when I changed the differential oil last year that I overfilled slightly. My concern is that the front differential seal is leaking and I was wondering if the differential and engine sump could be connected if an internal seal or part has failed? The MB procedure for the seal replacement seems somewhat complicated in order to set the back lash correctly. I would like to know if there is a simple procedure that would give a satisfactory result.

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