It is a 10mm square female on the plug. Craftsman drifts, punches, and
chisels have square metric handles. A 10mm one inserted into the plug and
turned with a 10-14" adjustable wrench works well.
On the other hand I have a supply of genuine Peugeot issue drainplugs which
have a 13mm male hex and the 10mm female square. They are $2. each, with a
couple of oildrainplug rings, if you remind me. They fit all the engines
that originally have the square recess plug (not N9T).
Brian Holm
At 01:52 PM 5/22/1999 -0500, Ken Kaminski wrote:
>Hello all,
>
>What size is the square drive on the oil drain plug for an '89 405S?
>Thanks in advance.
>
>Frank Kaminski
>
>
>
Brian Holm, Parts for Peugeots
at Peugeot Holm, since 1969
2120 Maple Hill
Plainfield, VT, 05667
802-454-7132, fax -1310