One of the best tips on DIY diff oil changes I received from this site is to remove the filler plug first. If you can't get that one out, you won't want to remove the drain one. Good advice.

Parts stores sell plungers specifically for this job. Usually around $10.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)