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I have a 1999 Boxster and I change the plugs every 30,000 miles.
I do believe there is not a true need to change them that often, but I do it myself and plugs are cheap.
I use Bosch 4-electrode "Platinum Ir Fusion" #4503 plugs.
I get them from RockAuto for $6.16 per plug. The last time I purchased them from RockAuto I got a $24.00 rebate.
Based upon this thread "Should I Change Plugs?", I just ordered a new set. Unfortunately now RockAuto only sells them in packs of 8.
And the rebate is still available until 31 Dec 2013.
I see this as a win win situation.
Just my two cents.
MNC-I
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