Autolite IR Extreme vs OEM NGK Iridium Spark Plugs?

[tomk17]

Going to change the plugs in my 04 3s with 63K miles. I can get the factory NGK plugs for $10 each shipped to my door from eBay but before I do, is it worth considering the Autolite Extreme Iridium plugs which are about 1/2 the cost? Being a semi-Ford product, wondering if the Autolites would play nice in there. Surely someone has tried them. Feedback appreciated and if there is a cheaper source for the NGK's please advise on that as well. - thanks

 

[njaremka]

sparkplugs.com

just get copper NGK's. cheap, and they work great in mazda engines.

 

[weatherdan822]

I've done some research and all the sources say it's best to stick with the original plugs, especially with foreign cars. So, I followed suit when I changed mine and put in the NGK Iridium plugs.

 

[tomk17]

Understood on the OEM plugs. One compromise might be the NGK Iridium IX plugs vs the Iridium Long Life ones. Both are Iridium and look the same, just $2.50 les per plug. The manufactures like the long life ones so they can claim lower overall maintainence but I, like most others, change them before the claimed 100K mile life.