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The solution to the problem of derelation of the butter hole when replacing the oil on Citroen C4 can be complete substitution of the pan (radical solution). It is either in the old pallet that the mucatum hole is drilling a large diameter, cutting threads, and buying a large diameter cork.
Also, to avoid replacing the pallet and not to change the cork, you can drill down into the old pallet with a large diameter, cut the threads, and twist the steel-pipe.