Differential Fill Plug Size??

[teen ti]

Hey everybody, so I'm trying to change my differential fluid in the ti but the hex bolt seems to be an odd size. i think its 14mm but it seems a little too small, and 15mm seems pretty big. could it just be that the bolt has rust buildup? i just don't wanna round off the bolt or my wrench, so is 14mm right?

[zoner]

Originally Posted by teen ti

Hey everybody, so I'm trying to change my differential fluid in the ti but the hex bolt seems to be an odd size. i think its 14mm but it seems a little too small, and 15mm seems pretty big. could it just be that the bolt has rust buildup? i just don't wanna round off the bolt or my wrench, so is 14mm right?

If it is a stock 168mm diff., yes- 14mm. Don't over tighten on the reinstall; always remove fill plug first!

[teen ti]

alright i thought so, i just was worried about rounding off the bolt or wrench. thanks for the help

[1996 328ti]

Originally Posted by zoner

If it is a stock 168mm diff., yes- 14mm. Don't over tighten on the reinstall; always remove fill plug first!

I can attest to that!, although my diff cover is aluminum.

[black98]

14 mm I just pulled the cover off my donor diff