Gu td42ti Ute cold start engine rattle

[mudski]

Without hijacking the thread (apologies)...
But is there a period plugs should be replaced within in ??? My 06 TD just hit 170k. And even on coldest mornings it starts and runs fine , every time.
Or only if they start playing up ?
The glow plug relay goes off when the coolant temps hit 30-32c on my car.

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If it ain't broke, don't fix it. But at 170K I'd assume they'd need replacing soon'ish.