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Hi,
Plugs are much more susceptible to Time rather than Mileage. Any Plug should be changed at least every 4 years regardless of Mileage. An added benefit to changing every 4 years is the fact that you are putting Steel Plugs in an Aluminum Head. These will effectively Weld themselves to the Head with corrosion with Time making them very difficult to finally remove. Hope this helps...
Happy Motoring!... Jim'99
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