Twin Ground Electrodes Plugs - Sticker on my engine?

I've just bought 6 NGK Iridium plugs for my 98 3.4L.

Now I've read that a lot of people don't like the iridium and now I see the following sticker on my engine (picture attached)?

My question(s):
Will the Iridium plugs work fine?

I don't see any of the listed NGK plugs with the twin electrode design?

If I should go with the standard NGK plug, does anyone have the model number? I see 3 or 4 listed on the site and I couldn't find the model number searching this site.

Thanks in advance for any help!

 

iunno..ive been running the single ground regular ngk plugs in my truck for about 10K now with no problems

 

According to the information that I found the engines require the "twin ground electrode" plugs. Toyota claims you will lose performance and gas milage w/ standard ground plugs. I can tell you I have had both and I did lose 2 mpg and also my performance suffered noticeably. (shifting wasn't as crisp nor was the acceleration.)

 

I work at a dealership and in the last two years i've seen like 3 or 4 comas come in with misfires because they used the bosch +2 platinums instead of regular ngk's. I would try getting iridiums from the dealership. BTW my sister's mazda had the same issue when i used autolites in it and i couldn't figure out what it was til i asked a friend at mazda and he told me to use ngk's

 

I'm with you. It cost me $250.00 once upon a time to find out that using a spark plug other than oem can cause a variety of issues. excess noise thru radio, misfires, poor gas mileage... Be very careful.

 

thread revival! how do i check the gap on these twin electrode plugs?

 

thanks chris!

 

will do, thanks

 

Interesting, I was looking at getting those. I know in my wife's Corolla the MPG is way better with Bosch than with NGK.

Would OEM be NGK, Denso or either?

 

Thanks.