Bit for transmission filler plug and drain plug on 2015 STI

mattr112 · Mar 14, 2018

So I was doing some searching around and I found a video on draining the transmission gear oil which says to use a T55 on the plugs, but he clarified in the comments that it is actually a 10 mm hex bit. I went out and bought a set of hex bits and I used 10 mm and it is constantly slipping to the point where if I continue to use it, it will completely strip the plug. Can anyone verify the correct bit to use to drain the filler plug and drain plug on the oil pan side? I know the clutch side is T70, but the service manual doesn't mention the correct bit for the other two plugs and I don't want to risk stripping the plug by trial and error. I already have to buy a new drain plug because it is pretty messed up.

Thanks!

EDIT: The part number for both of these are the same (807018060).
Transmission Gear Oil in the Service Manual

It might be a 14mm hex bit. My set only went up to 10mm so I'll have to go out and buy it and test it out.

VA STI · Mar 14, 2018

Impact guns and penetrating fluid work well as well. From what I remember it was a 10mm but its been a while since I changed fluids.

raisingAnarchy · Mar 14, 2018

I thought I remember using the 10mm size on my '16 STI for both the trans oil pan drain and fill plugs. This how-to states 14mm for the older STIs.
Changing the Transmission Oil on a Subaru Impreza WRX STI

I bought this set of hex sockets though and it might have what you need.
http://a.co/65MgeM8

Bit for transmission filler plug and drain plug on 2015 STI

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