Spark Plug Change Interval

[Jim44]

(08 Busa) Manual recommends change plugs at 7500 miles - are most of you following that type of schedule or running longer??? Thanks for any suggestions -

 

[HillbillyTom]

By the book, plugs are cheap.
And, this thread reminds me, they're due to be changed again.

 

[Mr Bogus]

I leave plugs in until the tell me they are tired..

hard starts
miss fire
falling fuel mileage

24K out of last set..

 

[b4thenite]

I change plugs every 10k miles or so, but they always seem fine.

 

[theskaz]

15k

 

[BA BUSA]

20k-25k depending when I am under the hood (gas tank) for some maintenance.
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[GPW]

A lot has to do with your tune. Read your plugs every 12K