Hi I'm changing the oil again on my mk4 fiesta and have rounded the sump plug (it was filed down last time after being rounded to a smaller size). So I've decided to buy a new sump plug (anyone know what size - 12 or 13mm?) and when it arrives try and get the rounded one off. I've heard that mole grips are good for this. Can someone please advise to the pair I should buy (e.g. curved jaw/straight jaw/long nosed etc). Thanks