Ford main dealers were the last ones to change the oil on my Focus 1.6 Ghia '55 reg and in doing so they overtightened the sump nut/bolt and left it rounded.
I used Bolt Grip (made by Irwin) to release it and Halfords has a replacement 'Sump Nut and Washer Kit' HSP608 at £2.99.
www.halfords.com/webapp/wcs/stores/servlet/product...y**_165746
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