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I have just noticed that Mrs F's 36k miles/6yr old plugs should have been changed at 30k/4yrs. This seems a retrograde step, especially as it's such a low revving turbo engine with many fewer sparks per mile than last century's small engined cars (usually no more than 2000rpm). Our 21yr old Focus got new plugs at 50k and 102k miles - and whenever I changed them they seemed just as good looking as the new ones with no change in gap. Is this because the advice hasn't been updated since the demise of plug-fouling leaded petrol?
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