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  #1  
Old 01-06-2004, 03:41 PM
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differential tool

What size is the star socket to check the differential oil?
Dwight

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Old 01-06-2004, 04:17 PM
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ericnguyen
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It's either 14 mm or 17 mm Allen hex for MB cars even though most of them have 14 mm. Do NEVER use anything else (e.g. a torx) to open these differential plugs. They are very tight and you will destroy them with your torx.

Eric
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  #3  
Old 01-06-2004, 04:25 PM
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Right, not a 'star', it's a hex. Well, unless things have changed on newer models...
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Old 01-06-2004, 04:56 PM
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There is a lower hex bolt on the side of the diff and a star bolt at the top in the back. '89 420 SEL
Dwight
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  #5  
Old 01-06-2004, 05:00 PM
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Both the fill and drain plugs are 14mm. The drain is on the bottom on the right side and the filler plug is on the rear cover.
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  #6  
Old 01-06-2004, 08:40 PM
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Loosen the "fill" plug first. If you can't get it off, then don't drain.

Also, try and remove the vent plug on top and clean it out with brake cleaner.

:-) neil

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