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Old 06-13-2003, 12:19 AM
WANT '71 280SEL's Avatar
I'll Go Upside Your Head!
Join Date: Jan 2003
Location: Dallas, TX
Posts: 3,378
What size wrench for differential plug on w124?

What do I need to remove the plug from a rear differential of a 1987 300E? It looks like a hex. I could probably make a torx work though. What size do I want before I go and randomly buy things.
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Old 06-13-2003, 12:32 AM
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You can do it
Join Date: Jun 2003
Location: OC S. California
Posts: 120
I have a 87 420sel, and I used 14 MM hex to for the differential plugs. Most probably it would be the same for your car also. AutoZone sell a set of 3 "1/2 inch drive hex bit set " for $8.00, get one from them. Always open the fill plug first, just in case you are not stuck with oil drained but fill plug stuck.
I hope this helps
87 420 SEL
Looking for a nice mid 80's MB diesel.
87 BMW 528e (Sold)
99 TOYOTA 4Runner
1989 Honda Accord (Sold)
1988 Honda Accord (Total)
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Old 06-13-2003, 05:03 AM
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Location: USA
Posts: 699
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.

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Old 06-13-2003, 01:10 PM
Gerard's Avatar
91 300CE M103: 80 450SEL
Join Date: Nov 2001
Location: Dublin, Ireland
Posts: 112
14mm hex

Its a 14mm hex on my 87 300d (124). One of my plugs bears the scars from a previous owner trying to open it with something stupid. If the plug is dirty get a scriber or narrow screwdriver and scrape out the gunk and crud. The hex or allen key will then fit more securely.
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Old 06-13-2003, 03:48 PM
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Join Date: Jan 2002
Location: Colorado Springs, CO
Posts: 1,006
TThe fill and drain plugs are 14 mm hex head (NOT Torx). They can be VERY tight. Often a 18-24" 1/2" drive breaker bar is necessary. Be sure to loosen the FILL plug first (in case you can't get the drain plug out). Its sooo very hard to turn the car upside down
Brian Toscano

Last edited by md21722; 06-13-2003 at 03:55 PM.
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