Some people recommand use OEM spark plugs instead of iridium. My question is how about the ZEX copper core spark plugs on customaxima.com? are they any better than OEM? OEM made by platnium right?

 

OEM are NGK Platinum. If you want to save $$$, grt NGK coppers. They work just as well, but should be replaced every 30,000 miles. At $6 a set, you still save $$$ over Plats or Iridiums, even changing them twice as often!

 

I second that. I dont see why I need to spend $12 a plug while I can spend 6 - 7 for 6 of them. of course....if you dont mind changing the plugs every 30k.

 

Coppers are great because you can coincide the spark plug change with a compression test, a treatment of SeaFoam, etc... making it a 30,000 mile "premium maintenance" ritual for you DIY'ers