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Originally Posted by MNBoxster
Hi,
Agreed on the extended service. But, most Platinum Plugs are marketed as a Performance enhancer which they certainly are not.
Platinum may extend the service life, but on a Performance Car you shouldn't be looking for that at all.
There are many reasons a Spark Plug can fail such as cracked electrodes or arcing and considering that they are perhaps the cheapest item to replace, especially on a Porsche, you should change your plugs every 25k mi. or 2 years whichever comes first. Stick with the OEM to preserve the proper indexing (something most don't consider or even know about).
Not doing so won't make the engine explode, but you should take the opportunity to inspect the CoilPak and the Sparkplugs and their Tubes and 'O' rings long before the 30k or 60k mi. intervals spec'd. Since you're already there so far as changing them is concerned, it's most practical to do so then. Fresh Plugs will aid in gaining max performance and max MPG, so the payback's there as well...
Happy Motoring!... Jim'99
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Although you could consider them a performance enhancement in that the performance of the plug does not degrade as quickly as a conventional plug, keeping up a consistant spark for far more miles.