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Old 08-28-2002, 11:17 PM
Registered User
Join Date: Apr 2002
Location: Connecticut
Posts: 61
Question 126 rear axle drain plug location

I crawled under my 1988 300sel to change the fuel filter and was going to drain the axle as well but could not find the plug.
The fill plug and vent is easy to find but I expected to see a plug at the botton of the differential.
Do I have to remove one of the bottom bolts holding the assembly? What does the plug look like? could it be covered with crud?
Would appreciate some help, thanks
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Old 08-28-2002, 11:44 PM
Join Date: Jul 2001
Location: Old Lyme, Connecticut
Posts: 3,596

Don't know exactly for your car but on every other MB I have owned the plug is on the bottom, it is 14mm socket, and yes, they get covered in crud. Never had to unscrew the back cover or anything, always had a plug. Good luck, Jim
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)
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Old 08-29-2002, 01:09 AM
Registered User
Join Date: Jan 2001
Location: oregon
Posts: 2,013
it's on the bottom of my 126's make sure you loosen the upper filler plug first,plugs can be very tight and you don't want to get bottom one out and then have trouble with top filler plug, use top quailty 14 mm hex scoket and make sure it goes all the way in..........
William Rogers......
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Old 08-29-2002, 08:04 AM
Registered User
Join Date: Apr 2002
Location: Connecticut
Posts: 61
Wink Thank you Jim & William

Thanks for the reply, I will look for that drain plug again tonight, is ti the same size as the filler plug? should I use semi synthetic or the straight 85-90W? I've got both.

Thanks again,
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