Join Date: Mar 2007
Location: Long Island, New York
'07 Sonata 2.4L GLS 5 speed manual
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My only experience was on my old Corolla. I put the Denso iridium version in hoping for a little more of "everything". End result was all I got was a little better cleaning of my wallet.
I actually called Denso after I removed my plugs and found my ground electrode seriously worn after about 35k. Turns out that the "long life" versions that are installed in newer cars are either platinum or iridium BUT they also have a platinum or similiar tipped ground electrode. The "basic" ones don't have that and ground electrode wears out fast. Not sure if due to more concentrated spark or other.
Tech also told me that on my stock motor I wouldn't notice any difference. If I was performance tuned and had a turbo or supercharger etc. then I might notice it.
The G as you ordered has the iridium center and platinum ground so should last a long time. Performance improvements? Butt-o-meter not reliable, dyno before after, meticulously tracked mileage/gallons with no variations about only way. If your happy there are worse things to spend money on. The tech told me stick with the regular and change out every 20-25k and I'd probably get better overall results because of new plugs and wind up at same cost after 100k miles.
Last edited by Sequoiasoon; 01-29-2013 at 04:10 AM.