Im not getting any hits, why? EVERYONE ISTALKIN about Iridiums but they are all mostly GS400 people. I have a 99 gs300 and even L-tune said that my suggested plugs are the denso platinum PK16TR11 plugs. So whats the deal? Do I have to use the platinums? Have anyone used the iridiums in the gs300 1999? Will they not run right or last as long? And to make everything more confusing there are denso iridium Ik16R11, Sk16R11, IK20s and SK20s. What the heck? I never thought getting spark plugs could be so dang complicated.

 

Also are all these plugs pre gapped or do I have to gap them myself?

 

oh well I guess Im putting in the platinums since none seems to know. But I find this hard to beleive with all these gs gurus

 

plugs should be pregapped and i used ngk iridiums plugs in my ls400 and my car felt like it had more pickup. but i dont know about the gs cars.

 

well my hood sticker says platinum, manual says platinum and lexus dealer says platinum. I was just wondering if the performance gurus here new something that they dont. So Im going with what the lamen says until further notice.

 

My father-in-law's 92 LS400 failed the emissions test last month. I put NGK Iridium plugs in, that's it, and it passed easily. Seems to run very well, too.

 

Torque Master's. Enough said.

 

I think for a car that's mostly stock you can't do better than the OE plugs.

Toyota has done a great job spec'ing the OE plugs, coolant, and brake fluid in particular.

 

NGK Iridiums. That's my vote.

 

I got ngk iridiums but when i took my old plugs out, they were multi ground and mine is just single ground. Did i get the wrong ones?

 

Toyota used multi-tipped platinum plugs before 00-01 or so. They switched over to iridium plugs after that all across the Toyota line(Camrys, Corollas, etc...). The plugs cost more but can technically last up to around 120k miles under normal driving conditions.

 

I guess that doesn't include you huh Jeff? lol

 

I change my plugs whenever I change my oil(every 5-7k miles on Amsoil Synthetic)
Then again, I'm running the NGK6097 copper plugs

 

Hey Jeff, can you send me a set of your plugs for my GS4? I can give them a second chance.! Seriously
No idea how many miles have the one of my car. Let see...$12 each =$96...
pm me please.

 

as far as i know, iridium is made to last longer. same goes with platinum. if u want performance, u use copper plugs, they are far cheaper, and copper is a better conductor, HOWEVER, they last as long as an oil change. Many supra guys use the copper plugs.

For overall performance, reliability, and straight out no need to worry for a while, go with either platinum or iridium. you cant go wrong with either or. I personally have always stuck with NGK in all my previous and current vehicles, haha, and lawn mower =P.

ive also heard good things about denso, but have not tried them personally.