I note from the NGK site that the PTR5A-13 plugs which I am about to replace (on 1.6 zetec) are obsolete---replaced by PTR5A-10. Can I assume that these are exactly the same plugs, but with 1mm gap instead of 1.3mm. My local Halfords still stocks the old version, so if I buy these shoud I regap them to 1mm. Alternatively there are Champion EON4 (copper) and Champion RES9PYP4 (platinum, and cheaper than the EON4). Or would I be better off sticking to Motorcraft platinums. Your opinions and experience appreciated.
Brian