JoeSpareBedroom wrote:
....

Spoke to her a little while ago. She's thinking they may never have been
replaced. She's checking through a pile of receipts, while complaining that
our mechanic should've told her to do plugs at the recommended interval.
....

The plug itself almost certainly had nothing to do w/ it...it's just a
symptom of what went wrong. Nor would have replacing them @100k or
whatever was the recommended interval likely have made any difference.

--