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Reference spark plugs.
I have a 1999 Boxster, so my interval between spark plug changes is 30,000 miles.
I personally enjoy changing mine, but I wonder if I can go up to 48,000 miles between changes as recommended for a 2001 3.2L.
Plugs are cheap and each time I replace mine, I see very little wear/degradation.
Just my thoughts
MNC-I
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