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I replaced mine at about 60,xxx miles and the engine smoothed out a bit. I'll add that I don't believe my engine had the proper plugs before I made the change: the old ones were a 2 electrode Bosch. I replaced them with Beru Ultra-X, UXF79 0 002 335 601. These were purchased from Zim's Autotechnik, a company who often advertises in the back of Panorama. Hope that helps out a bit.
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