Quote Originally Posted by kiper
wow?! 4 years?

Platinum spark plugs sa escape ko.. I change it every 25k-30k kms.. bago pa pumalya.

iridiums can go as much as 50k-100k kms.

ung mga ordinary nasa 5k-20k kms.

try searching for other spark plugs threads here.
I change mine from normal electrode to platinum when I just bought the truck, 5 years and 70,000 miles later, its still on the truck and purring like a big cat.