Hi all,

Thought I'd start a new tiny topic.

I am driving my rusty Sigma again now we are heading towards the cooler months.
So the other day I thought that I really should check to see if the diff still has enough oil in it.
This because I don't remember ever checking it before.

I expected some kind of metal screw plug that would be easy to undo and hence a 5 minute job.
Instead there is a black rubber filler plug just above the axle centre line.

I tried gentle prying but the thing won't pop out.
Since its old and probably irreplaceble I left it alone.

Does anyone know if this rubber bung, on the inside, is flare locked or just a bit expanded?
My manual tells me nothing.