I received an email from O'Reilly's auto parts store last week, they have Autolite and Delco platinum and iridium sparkplugs on sale through the end of this month .
With the sale price and a manufacturers mail in rebate the prices of the Autolite double platinum plugs are about the same as standard plugs, $1.99 each .
I need new plugs for the oilhead, they have been installed, for 46,000 miles, 75,000 km .
I use standard NGK plugs in the R65's .