Originally posted by boydapa
i have a set of splitfire sparkplugs in my engine for 2 1/2 yrs already. gaano ba katagal ang lifetime neto? at kelan ako magpapalit? kasi nun tinignan ko looks like new to me---halos ganun pa rin itsura nilinis ko lng yun itim sa gilid maputi na uli. thnx
I'm also using this type of spark plugs pero 1 week pa lang. according to their site's FAQs (quoted below), it's 36 months but it's totally up to you.

How long will SplitFire Spark Plugs last?

A: SplitFire, Inc. guarantees that SplitFire Spark Plugs will meet or exceed your automotive or truck manufacturer's spark plug performance standards in a properly tuned automobile or truck with a non-modified engine for 36 months, regardless of mileage driven, or we will replace the spark plugs. (See our Warranty information sheet for full details of this limited warranty.)