[roundl]

I see the fill plug on the differential. Is there a drain plug on the bottom of the diff or do I just remove the cover and replace the seal?

 

[DaveJ]

If you remove the bottom central bolt on the differential cover, the fluid should start draining out.

 

[roundl]

thanks..

would you recommend 80 or 90 w?

 

[GTJIM (R.I.P.)]

Diff Oil

Opel specify 1 1/2 pints of EP80 or EP 80W-90