I am going to change my transmission oil at my farm work shop this weekend and want to know what size of drain plug wrench I am going need. It is too cold and wet for me to shimmy under the un-jacked up car in the gravel today.

Just want to make sure I have the correct wrench available, it is out in the boonies.

I saw on one site that it was a star tool but I wonder if it was a newer car. A search here was inconclusive.

Thanks in advance.

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85 Merc 300D - Unwinding 31 years of wear
86 VW TD
Mahindra Diesel
Iseki Diesel

In 2007 I didn't own a diesel.

On the 1983 300SD 722.303 trans. you'll need a 5MM Allen for both the pan and the torque converter drain plugs.

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1986 190D 5 cyl. 5 speed manual White (215K),
1983 300SD Silver blue (103K)