2005 chevy trailblazer_ls
Hi Everyone. I drive a 2005 TrailBlazer with about 76,000 miles. I want to replace the spark plugs and originally bought NGK Platinums ($3 plugs). However after doing some research (which I should have done prior to buying the plugs :duh I realized the ones in the manual are AC Delco double platinum plugs (which run about $6 a plug). However they do not make them anymore and the guy at Auto Zone said that they now recommend the Iridium plugs ($7 a plug). I then looked in one of those do-it-all manuals they have at Auto Zone, and that manual says to use an AC Delco platinum ($3 plugs). I am very confused on what to get... are the NGK Platinums I have good enough? Or should I buy Iridiums? Should I go with AC Delco or NGK?