Iridium plugs

Couldn't find anything about this so hopefully someone can help me out:
In the Haynes manual it says use iridium spark plugs after 90k miles but doesn't say why. I know that the iridium ones are supposed to last longer but are there any other benefits?
I can get 6 plugs from toyota for 20$ vs 5-6$ each for the iridium plugs

 

https://www.tacomaworld.com/threads/ngk-iridium-9-6619.513857/#post-16192627

Doesn't sound like they're needed, and may be detrimental.

 

If stock plugs took you 90k.............

 

Iridiums are for the 4 cyl - not the 6 cyl.

Yeah...I know...some people here claim the Iridiums work in the 6 cyl and maybe they do. I'm more inclined to go with what the mfg. calls for in the owners manual.

 

I think the iridium plugs are for the 4cyl

 

Ive been running irridium plugs (Bosch) in my truck for 40k miles.

ZERO issues.

 

Well the Haynes manual failed to mention that the iridium plugs were for a 4 cylinder. Based on what I read in that other thread, I think I'll just be grabbing the stock plugs from eBay for 20$
Thanks for the help everyone

 

all you need.........this plug.......

got mine for $4 sumthing........

 

Another OTC option....stocked at AutoZone.

 

^^^^^^^^^^^^

you're 2 plugs short.........

 

Bought 6.

 

Guys, don't be such a stickler to what Toyota recommends.

If a reputable parts manufacturer, lets say NGK in this case, lists an Iridium plug for your car in their parts catalog, you can count on the part having been tested and approved for installation in your vehicle. They wouldn't be in business long if the parts lead to failure in your vehicle. And you don't hear Toyota saying not to buy them. BTW, Toyota owns part of NGK, and Denso ... which I think is why both brands come installed in our trucks from the factory.

I have 95K on the NGK Iridiums in my Taco; engine runs smooth and is as responsive as the first drive. The same Iridium plugs came installed in wife's 07 Lexus and Toyota recommends replacement in 120K intervals. But, I'm sticking to 100K replacement intervals. All my other Toyota products are also running NGK Iridiums and I plan on replacing them after 100K miles, although I will pull them at 50K'ish for inspection and cleaning.

 

I use Iridium plugs in my 6cyl jeep Comanche. Been using them for a couple of years.

 

I've been running Iridiums in mine (V6) for the last 60,000 miles/11 years. No issues.

 

I've been running iridium plugs in mine for 50K miles. I almost swapped them out this summer, but didn't get around to it. Truck is a little over 95K miles. I'll check the gap on a couple of them next summer. I don't see any need to deal with them in the winter. They've worked just fine for me.

 

You’ll get Iridium plugs (

$9 Denso IKH22 Iridium Power Spark Plug, (Pack of 1)

Denso IKH22) if you buy TRD/Magnuson Supercharger.

And yes, they work flawlessly. I’m now running with Denso Iridium Tough (VKH22), even better longevity.

 

The ONLY reason why you get iridium plugs when you do a supercharger is the fact that the driver side bank of cylinders requires you to remove the supercharger completely to change the plugs on that side. Iridiums net longer plug change intervals and subsequently less time removing and reinstalling the super.

That stated,

Stick to el cheapo DENSO standard plugs unless you are boosted in the v6.

 

According to the owner's manual, you use copper plugs for the 6 cylinder and you can use iridium plugs for the 4-cylinder. NGK and Denso makes a good product, so I just stick with whatever the owner's manual says because that's what the engine was designed for. Kind of a conservative old school thought, but you can't go wrong.

 

I have also been running the iridium plugs in my 6 cyl taco for about 30k with no issues. I would likely use the same again.

 

Remember that the manufacturer have to keep costs down, so there is no intrest to install more expensive parts if cheapers work well too. So, there is a lot of things to upgrade.