Oil Plug thread size.

[rodrigo]

I'd like to know the thread size of the il frain plug on our cars (E30).
I've performed a search and came up with nothing...and I don't have a thread sizing kit.

I want to make sure I am getting all the proper stuff before I drill and tap the oil plug to the next size...the p. o. stripped the freekin thing! :hitler:

[lordofthewaters]

M12x1.5

[jlevie]

A better fix would be to install a HeliCoil or Timesert thread insert. That aloows the use of the standard drain plug.

[rodrigo]

Thank you for the size, lordofthewaters.

Jlevie, I'm not too hot on the idea of a time sert, or a helicoil...I think it would be a better job to drill and tap another thread. Using a larger plug bolt really does not bother me, but I'd have to find a crush washer to use with it. I'm still debating it from each side.

[jlevie]

If your concern is about the strength or longevity of an insert repair, be aware that inserts are commonly employed on new parts where strength and wear are issues. A properly installed insert results in stronger threads than when the pan was new.

[rodrigo]

A properly installed insert results in stronger threads than when the pan was new.

...and the insert would be steel, not another aluminum thread.
hmmmm...guess I'm going back to the insert side of the fence...