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- Jan 1, 2024
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Iridium spark plugs
Iridium Spark Plugs
- Thread starter jerseyguy357
- Start date
Are so pre-covid, everyone is now onto Ruthenium.
Iridium tips are still the longest life. Ruthenium tips came along because of the high cost of iridium.
Tip materials change the expected longevity. They don’t make them into super duper plugs that increase your gas mileage by 10%.
There are no “copper” plugs. No plugs use copper as the tip material. Less expensive tips are generally nickel. Most plugs have a copper core.
Tip materials do not materially change the resistance of the plug. That’s a false narrative that is sometimes seen.
Assuming of course that’s what this odd thread is asking.
Tip materials change the expected longevity. They don’t make them into super duper plugs that increase your gas mileage by 10%.
There are no “copper” plugs. No plugs use copper as the tip material. Less expensive tips are generally nickel. Most plugs have a copper core.
Tip materials do not materially change the resistance of the plug. That’s a false narrative that is sometimes seen.
Assuming of course that’s what this odd thread is asking.
Except for turbos, don't do the grandpa thing of checking your iridium's before 100,000 miles. 
They are a must when replacing them is difficult!
How about the old Fire Injectors that JC Whiteney sold....
What year would the ad be from
Patman
Staff member
It was definitely odd that the original poster didn’t really ask a question here. I’m not sure I’ve ever seen a post like this here before.
But if it is asking about the longevity of iridium plugs, then I will say this. I have 181,000 miles on the original iridium plugs in my Civic and they appear to be working perfectly fine. I have actually heard of a few other 2.0 Civic owners who have gone even longer than me, one who recently told me he’s at 250,000 miles.
Were those the ones guranteed to fire off in oil or some such?
Yes and they had multiple points on the plug to fire...
I remember helping my dad gap/replace plugs annually every 12k/12 months. Now kids are totally clueless since plugs ie Toyota 2GR-FE are 120k/ 10yrs. Goods news is Toyota 4DS direct injection which recommends 60k/5yr and now kids have opportunity to learn wrenching. Lol
My 3 cars owner's manual's state to replace plugs with either Denso or NGK Iridiums. They are older engines, 03',06',13'. They work great and last at least 100-120K. The engines run fine on them. If it's not broke, don't fix it. I give them what they want.