E-Class (W211) 2003-2009

Differential Fill Plug Torx Size?

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Old 08-01-2021, 09:26 PM
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1998 E320 Wagon, 2003 W211 E500, 2003 W211 E500, 1999 W210 E55 AMG
Unhappy Differential Fill Plug Torx Size?

So, gathered LiquiMoly differential gear oil 85W-90, a little pump, and a 14mm hex key at the end of a socket. Jacked up the rear end, set up the stands and moving blanket to ease the old bones, and crawled underneath. The 14mm fit the drain bolt, but surprise of surprises, when I went to first undo the fill plug, it turned out to be a Torx config. Why do they do this?

Can anyone say with certainty what size this Torx is?

I also understand that Torx come in flat and beveled ends. It strikes me that a flat end would also fit a beveled config. Is this so? Can anyone tell from the photo if the plug requires a beveled or flat Torx?

Is the truth out there?

Old 08-02-2021, 01:05 AM
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03' Mercedes-Benz E500
May have lost the original plug and replaced it with a torx? weird...Looking at that picture it looks like a Hex though.

Last edited by Gangrene3075; 08-02-2021 at 01:19 AM.
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Old 08-02-2021, 08:16 AM
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20' RCF, 18' NX, 09' E350, 07' Solara, 05' STi, 01' Ranger
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Both are hex.. The picture above is 100% hex and not torx/torx +..

I just did my rear diff less than a month ago. Both plugs were identical and were 14mm however the one plug was clearly tighter. To my knowledge neither were removed or serviced before.

You can buy the new hex diff plugs from fcp euro. Technically the service bulletin says to replace both. After reading multiple people on here stating you can reuse and just use loctite on the last thread, that's what I did. If both were different like your's I'd buy both knowing they are the same. Having to swap tools for the same plug would annoy me. Torx can come in a + which is more round,. My truck takes certain torx + and if you try using a normal torx bit on it you will eventually strip the fastener/bolt... I'll take a picture of them when I get home today from work.

-Nigel

Last edited by NewShockerGuy; 08-02-2021 at 08:19 AM.
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Old 08-02-2021, 10:02 AM
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1998 E320 Wagon, 2003 W211 E500, 2003 W211 E500, 1999 W210 E55 AMG
Originally Posted by Gangrene3075
May have lost the original plug and replaced it with a torx? weird...Looking at that picture it looks like a Hex though.
Didn't fit the first time, or maybe it's dirty or damaged. I'll set it up and try it again.

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