I have a 1981 Mercedes 240d with a manual transmission, and i would like to buy a drain plug that has a magnet built into it. i cant seem to find the metric dimensions of the plug, so i can see about ordering one.

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Grey '91 350SDL 214k Dad's car
Beige '81 240D 4 Speed 254k SOLD
Blue '82 300D 225k SOLD
White '95 E300D 46k SOLD
Blue '87 190D 2.5 Turbo 315k SOLD
Brown '80 240D 4 Speed 716k SOLD
Beige '80 300D N/A 119k SOLD
Blue '85 300D Model 186k T-Boned

bump, anyone know?

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Grey '91 350SDL 214k Dad's car
Beige '81 240D 4 Speed 254k SOLD
Blue '82 300D 225k SOLD
White '95 E300D 46k SOLD
Blue '87 190D 2.5 Turbo 315k SOLD
Brown '80 240D 4 Speed 716k SOLD
Beige '80 300D N/A 119k SOLD
Blue '85 300D Model 186k T-Boned

While I don't know the exact answer to your question, what is probably wearing in the transmission are the syncho rings. Which I'm pretty sure are brass. Brass isn't magnetic.

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68 280SL - 70 280SL - 70 300SEL 3.5 - 72 350SL - 72 280SEL 4.5 - 72 220 - 72 220D - 73 450SL - 84 230GE - 87 200TD - 90 190E 2.0 - 03 G500

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Yes your right but brass will wear down to nothing ,only a colour of brass in the end And if the gearbox is 50 /50 steel and brass its worth putting a magnetic plug in .Just for the piece of mind. Art if you email the people that sell the sump plugs they will tell you the size you want. I think your not the fitrst to request one.