Hi Dinesh,

How much oil is leaking? Is it a lot?

And when does it happen? If it happens when the compressor shuts down it is because oil and compressed air finds it way back through the inlet valve.

This should not happen because there are check-valves that prevent this.

It depends a little on the exact model - but please overhaul the check valve at the element outlet and also the oil stop valve.

Good luck!

Cas