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IF the spark plugs WORK in the first place, there is NOTHING to be gained--or--lost by switching to exotic-metal plugs.
The ONLY thing these metals do is LAST longer (~100K miles) & more reliably (EPA emissions) than "normal" plugs because of their much higher melting temperatures and much lower ionic erosion(*)...even WITH their much smaller diameter size.
Melting points:
4,436ºF - Iridium
3,215ºF - Platinum
2,618-2,582ºF - Nickel-Iron
(*) = EPA-mandated 100K "life" for emission-related components, etc.
Last edited by gone-ot; 06-11-2014 at 02:10 PM..
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