You've posted in the classic Panda section. Mk1 & 2.
Torque figure is:
196Nm or
144 lb ft
But your name suggests it might be the later one, 2004-2012, Mk3.
Which is:
240Nm or
177 lb ft
Whichever it is, always use a new nut. It will always retighten to the same place, or nearly, and you shouldn't re-stake it using the same bit as it may fracture and therefore not have anything to prevent it loosening.