Bosch Platium Spark Plugs From Autozone Are Plain Junk If They Have The 2 Black Rings On The Top Of Them. Only The Platium From Mb With The Blue Rings Will Work In These Cars. I Have Fixed Many Cars By Throwing Away The Autozone Bosch Platium. The Plain Bosch Super Plugs Work Great. Platium Is Just For Long Life. I Want My Plugs Changed After 30 K Any Way.