Spark plug service intervals

Altezza-Dan

Altezza-Dan

Octane Boostaholics
How often should you need to change the plugs on Subaru's? There is about 20K on mine at this stage
 
standard as far as i know, not sure which type there are, need to find out which ones they take

are standard plugs made by Denso or NGK? What benefit would there be in going one step colder than stock?
 
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