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Manufacturers say the original plugs will last 100K miles.

I have taken out plugs that had 100K on them, yes they still look good,

I changed the plugs on my neighbors Buick, the owners said the car felt like it had more power, with a fresh set of standard plugs.

Plugs take an awful beating, for 8 to 12 bucks, I think changing them every few years wouldn't be a bad idea.
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